engine/exchanges: Add GetCurrencyTradeURL wrapper func/gRPC endpoint (#1521)

* beginning the concept

* expands testing and implementations

* test standardisation, expansion

* more

* finish remainder, add rpc func

* lint

* grammar? I barely know her!

* wow i forgot something wow wow wow wow

* rm SendPayload

* enFixio!

* improve binance long-dated support

* update test design, update wrapper funcs

* adds kraken futures, adds bybit support

* fixes SIMPLE bugs

* s is for sucks

* fixed option url x2

* fixed silly test

exchanges/bithumb/bithumb_wrapper.go

@@ -864,3 +864,13 @@ func (b *Bithumb) GetFuturesContractDetails(context.Context, asset.Item) ([]futu
 func (b *Bithumb) GetLatestFundingRates(context.Context, *fundingrate.LatestRateRequest) ([]fundingrate.LatestRateResponse, error) {
 	return nil, common.ErrFunctionNotSupported
 }
+
+// GetCurrencyTradeURL returns the URL to the exchange's trade page for the given asset and currency pair
+func (b *Bithumb) GetCurrencyTradeURL(_ context.Context, a asset.Item, cp currency.Pair) (string, error) {
+	_, err := b.CurrencyPairs.IsPairEnabled(cp, a)
+	if err != nil {
+		return "", err
+	}
+	cp.Delimiter = currency.DashDelimiter
+	return tradeBaseURL + cp.Upper().String(), nil
+}