exchanges: Limit mock test JSON data size by truncating slices and maps (#1968)

* set limiter to first level mock data list and updated unit tests

* address nested slices length limit

* minor fix recording file and update unit tests

* minor updates on unit tests

* re-record mock files and minor fix on the unit tests ti adapt the mock data change

* improve http recording limit value and fix issues with mock data in binance

* added MockDataSliceLimit in request items and resolve minor unit test issues

* resolve missed conflict

* rename mock variables, resolve unit test issues, and other updates

* minor fix to CheckJSON and update unit tests

* minor unit test fix

* further optimization on mock CheckJSON method, unit tests, and re-record poloniex

* common and recording unit tests fix

* minor linter issues fix

* unit tests format fix

* fix miscellaneous error

* unit tests fix and minor docs update

* re-record and reduce mock file size

* indentation fix

* minor assertion test fix

* reverted log.Printf line in live testing

* rename variables

* update NewVCRServer unit test

* replace string comparison with *net.OpError check

* restructur net error test

* exchanges/mock: Remove redundant error assertion message in TestNewVCRServer

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

exchanges/exchange_types.go

@@ -241,6 +241,7 @@ type Base struct {
 	Features                      Features
 	HTTPTimeout                   time.Duration
 	HTTPRecording                 bool
+	HTTPMockDataSliceLimit        int // Use with HTTPRecording to reduce the size of recorded mock data
 	HTTPDebugging                 bool
 	BypassConfigFormatUpgrades    bool
 	WebsocketResponseCheckTimeout time.Duration