orderbook: consolidate slice array types to orderbook package (#1992)

* orderbook: consolidate slice array types to orderbook package

* Update exchanges/bybit/bybit_types.go

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* linter: fix and add test

* cranktakular: nits

* cranktakular: nits

* Update exchanges/orderbook/orderbook_types.go

Co-authored-by: Gareth Kirwan <gbjkirwan@gmail.com>

* Update exchanges/gateio/gateio_test.go

Co-authored-by: Gareth Kirwan <gbjkirwan@gmail.com>

* gk: nits consolidation

* gk: rm unifySpotOrderbook func

* gk: nit but different

* linter: fix

* gk: nits

* glorious: nits

* Update exchanges/binance/binance.go

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

* Update exchanges/binance/binance_cfutures.go

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

* Update exchanges/binanceus/binanceus.go

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

* thrasher-:nits

* thrasher-: more nit

---------

Co-authored-by: Ryan O'Hara-Reid <ryan.oharareid@thrasher.io>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Gareth Kirwan <gbjkirwan@gmail.com>
Co-authored-by: Adrian Gallagher <adrian.gallagher@thrasher.io>

exchanges/bybit/bybit_test.go

@@ -47,7 +47,6 @@ const (
 	canManipulateRealOrders = false
 
 	skipAuthenticatedFunctionsForMockTesting = "skipping authenticated function for mock testing"
-	skippingWebsocketFunctionsForMockTesting = "skipping websocket function for mock testing"
 )
 
 var (