exchanges: Add OKX support (#1005)

* public endpoints methods added

* Completing mapping REST endpoints

* Binanceus Wrapper methods -Partially

* Binanceus Wrapper methods -Partially

* BinaWra functions with test funs; Not Completed

* Finalizing wrapper methods & test

* Fix & Complete wrapper functions

* Finalizing wrapper methods & test

* Adding Stream Datas

* WS Test functions

* CI: Fix golangci-lint linter issues

* CI: Fix reverting unnessesary changes and type conversion issues

* CI: Fix reverting unnessesary changes and type conversion issues

* Adding Public endpoints and tests

* Adding Market and Public Endpoints

* Adding Public endoints

* Public Trading Endpoints & Authenticated Trade order methods

* Adding Authenticated Methods and Tests

* Adding algo and Funding Authenticated endpoints

* Adding funding trading endpoints and correspondint tests

* adding authenticated endpoints

* Completing Block Trading endpoints and added subaccount endpoints

* Completing sub account and grid Trading endpoints

* Adding Rate Limit and missing endpoints

* Wrapper and Websocket handlers

* Fixing Websocket Test and Push Data Handler Issues

* Fixing Websocket Test and Push Data Handler Issues

* Fixing linter issues, package dependency, and other slight tempos

* Fixing linter and slight tempos

* Update on test functions, and Rest and Websocket Endpoint handlers

* Remove okex, adding comments, and slight fixes on endpoints.

* Fixing linter issues and adding comments

* Slight code changes, updating documentation, and n and linter issues

* Fix context and configuration endpoint issues

* slight fixes on config and test files

* adding some missing test and fix linter issues

* fix linter issue

* Slight fixes on code structure, shorthand exp,and ot and other

* Fix slight linter issue

* Slight code fixes and fixing linter issues

* fixing linter iissues

* fixing linter iissues

* slight linter issue fix

* slight linter issue fix

* Fix on models, type convert funcs and endpoints

* Adding Error messages map and update of models

* Fix on error message string and linter issues

* Fix slight linter issue

* Fix slight linter issue

* Fixing type converts, models, and linter issues

* Adding Ws fixes

* Slight fix on websocket and other issues

* Adding slight websocket fixes

* Remove 'books5' channel default subscription

* Small changes on default subscription and checksum

* Fix slight websocket tempos

* Fix Wrapper function tempost and linter issues

* Resolving slight naming and other issues

* Resolve slight pointer issues

* resolve slight linter issues

* Resolve config files issue

* Update websocket and wrapper funcs with test and docs

* fixs on websocket multiplexer, types, and other slight issues

* fix slight linter issues

* slight update on web-socket orderbook and tickers

* fix slight issues and websocket runtime errors

* Slight unit test fix and assing simple semaphore

* FIx race issue

* Update on authenticated endpoints

* Fix wsSetupRun check in websocket 'setupWsAuth' func

* Update wsSetupRun check in websocket 'setupWsAuth' func

* Slight update on websocket handling

* Fix some race conditions

* fix slight tempos

* fix authenticated test issues

* Update on conditional statements

* slight update on unit test

* fix unit test tempos

* Fix slight tempos

* Change check map from struct valued to bool valued

* slight fix trial

* Slight unit test update

* Fix websocket timeout error

* Updating websocket subscription endpoints, and unit tests

* update unit tests

* Slight issue on wrapper method 'GetActiveOrders'

* Overall code update

* Addressing missing review comments

* Fix unit test tempo and linter issue

* Monor fix

* Slight update

* Slight unit test fix

* Slight fixes

* Slight fixes

* Fixing on missing review comments

* Adding WS Fixes

* slight fix

* Monor fix on unit test

* Minor convert issue

* Minor change on WS

* Monor logic fix

* Fix code structure and logic issues

* Fixing small typos

* fix slight data format issue

* Update on trade and order wrapper methods

* Adding slight update

* fix on order detail

* Slight update on FetchTradablePairs wrapper method

* Slight update on wrapper

* Update on deserialization and other slight issues

* Final update

* Resolve missing review comments

* Slight update on config and unit test

* minor fix on GetDepositAddress param

* Minor fix

README.md

@@ -43,7 +43,7 @@ Join our slack to discuss all things related to GoCryptoTrader! [GoCryptoTrader
 | Lbank | Yes | No | NA |
 | LocalBitcoins | Yes | NA | NA |
 | OKCoin International | Yes | Yes | No |
-| OKEX | Yes | Yes | No |
+| Okx | Yes | Yes | NA |
 | Poloniex | Yes | Yes | NA |
 | Yobit | Yes | NA | NA |
 | ZB.COM | Yes | Yes | NA |
@@ -145,10 +145,10 @@ Binaries will be published once the codebase reaches a stable condition.
 
 |User|Contribution Amount|
 |--|--|
-| [thrasher-](https://github.com/thrasher-) | 667 |
-| [shazbert](https://github.com/shazbert) | 260 |
-| [gloriousCode](https://github.com/gloriousCode) | 199 |
-| [dependabot[bot]](https://github.com/apps/dependabot) | 99 |
+| [thrasher-](https://github.com/thrasher-) | 670 |
+| [shazbert](https://github.com/shazbert) | 268 |
+| [gloriousCode](https://github.com/gloriousCode) | 202 |
+| [dependabot[bot]](https://github.com/apps/dependabot) | 130 |
 | [dependabot-preview[bot]](https://github.com/apps/dependabot-preview) | 88 |
 | [xtda](https://github.com/xtda) | 47 |
 | [lrascao](https://github.com/lrascao) | 27 |
@@ -160,6 +160,7 @@ Binaries will be published once the codebase reaches a stable condition.
 | [vadimzhukck](https://github.com/vadimzhukck) | 10 |
 | [140am](https://github.com/140am) | 8 |
 | [marcofranssen](https://github.com/marcofranssen) | 8 |
+| [geseq](https://github.com/geseq) | 7 |
 | [dackroyd](https://github.com/dackroyd) | 5 |
 | [cranktakular](https://github.com/cranktakular) | 5 |
 | [khcchiu](https://github.com/khcchiu) | 5 |