Binance,Okx: Add Leverage, MarginType, Positions and CollateralMode support (#1220)

* init

* surprise train commit

* basic distinctions

* the terms of binance are confusing

* renames and introduction of allocatedMargin

* add new margin funcs

* pulling out wires

* implement proper getposition stuff

* bad coding day

* investigate order manager next

* a broken mess, but a progressing one

* finally completes some usdtmargined stuff

* coinMfutures eludes me

* expand to okx

* imports fix

* completes okx wrapper implementations

* cleans and polishes before rpc implementations

* rpc setup, order manager features, exch features

* more rpc, collateral and margin things

* mini test

* looking at rpc response, expansion of features

* reorganising before the storm

* changing how futures requests work

* cleanup and tests of cli usage

* remove silly client side logic

* cleanup

* collateral package, typo fix, margin err, rpc derive

* uses convert.StringToFloat ONLY ON STRUCTS FROM THIS PR

* fix binance order history bug

* niteroos

* adds new funcs to exchange standards testing

* more post merge fixes

* fix binance

* replace simepletimeformat

* fix for merge

* merge fixes

* micro fixes

* order side now required for leverage

* fix up the rest

* global -> portfolio collateral

* Update exchanges/collateral/collateral_test.go

Co-authored-by: Adrian Gallagher <adrian.gallagher@thrasher.io>

* adds fields and todos

* rm field redundancy

* lint fix oopsie daisy

* fixes panic, expands error and cli explanations (sorry shaz)

* ensures casing is appropriate for underlying

* Adds a shiny TODO

---------

Co-authored-by: Adrian Gallagher <adrian.gallagher@thrasher.io>

backtester/data/kline/live/live_test.go

@@ -14,7 +14,7 @@ import (
 	gctkline "github.com/thrasher-corp/gocryptotrader/exchanges/kline"
 )
 
-const testExchange = "binanceus"
+const testExchange = "okx"
 
 func TestLoadCandles(t *testing.T) {
 	t.Parallel()
@@ -73,7 +73,9 @@ func TestLoadTrades(t *testing.T) {
 		ConfigFormat:  pFormat,
 	}
 	var data *gctkline.Item
-	data, err = LoadData(context.Background(), time.Now().Add(-interval.Duration()*10), exch, common.DataTrade, interval.Duration(), cp, currency.EMPTYPAIR, a, true)
+	// start is 10 mins in the past to ensure there are some trades to pull from the exchange
+	start := time.Now().Add(-time.Minute * 10)
+	data, err = LoadData(context.Background(), start, exch, common.DataTrade, interval.Duration(), cp, currency.EMPTYPAIR, a, true)
 	if err != nil {
 		t.Fatal(err)
 	}