codebase: Cleanup various things (#1935)

* codebase: Rid base64/hex to string common funcs

* codebase: Rid local scope variable usage and other improvements

* codebase: Refactor currency pair usage across multiple exchanges

- Updated HitBTC tests to use the new currency pair format.
- Modified Kraken futures types to use currency.Pair instead of string for Symbol.
- Adjusted Kraken wrapper methods to handle currency pairs correctly.
- Refined OKX tests and types to utilize currency.Pair for instrument IDs.
- Enhanced Poloniex tests to consistently use predefined currency pairs.
- Streamlined order and orderbook tests to replace string pairs with currency.NewBTCUSD().
- Improved Yobit tests to utilize a standardized currency pair format.
- Updated validator wrapper to use currency pairs directly instead of string conversions.

* codebase: Use types.Number where possible

* refactor: update PayoutFee type to types.Number for consistency

* Refactor: Remove crypto functions to use standard library and other minor changes

- Removed custom crypto functions for SHA256, SHA512, and MD5 from the common/crypto package.
- Replaced usages of removed functions with standard library implementations in various files including:
  - cmd/websocket_client/main.go
  - engine/apiserver.go
  - exchanges/kraken/kraken.go
  - exchanges/lbank/lbank.go
  - exchanges/okx/okx_business_websocket.go
  - exchanges/kucoin/kucoin_websocket.go
  - gctscript/vm/vm.go
- Updated tests to reflect changes in the crypto functions.
- Renamed several functions for clarity, particularly in the context of order book updates across multiple exchanges.

* refactor: replace assert with require for consistency in test assertions

* refactor: Improve Binance futures candlestick test, standardise orderbook update function names and improve test parallelism

* refactor: Replace require.Len with require.Equal for better output in TestGetFuturesKlineData

database/repository/exchange/exchange_test.go

@@ -6,6 +6,8 @@ import (
 	"path/filepath"
 	"testing"
 
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 	"github.com/thrasher-corp/gocryptotrader/database"
 	"github.com/thrasher-corp/gocryptotrader/database/drivers"
 	"github.com/thrasher-corp/gocryptotrader/database/testhelpers"
@@ -55,7 +57,8 @@ func TestMain(m *testing.M) {
 }
 
 func TestInsertMany(t *testing.T) {
-	testCases := []struct {
+	t.Parallel()
+	for _, tc := range []struct {
 		name   string
 		config *database.Config
 		seedDB func() error
@@ -75,43 +78,30 @@ func TestInsertMany(t *testing.T) {
 			},
 			seedDB: seed,
 		},
-	}
-
-	for x := range testCases {
-		test := testCases[x]
-
-		t.Run(test.name, func(t *testing.T) {
-			if !testhelpers.CheckValidConfig(&test.config.ConnectionDetails) {
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+			if !testhelpers.CheckValidConfig(&tc.config.ConnectionDetails) {
 				t.Skip("database not configured skipping test")
 			}
 
-			dbConn, err := testhelpers.ConnectToDatabase(test.config)
-			if err != nil {
-				t.Fatal(err)
+			dbConn, err := testhelpers.ConnectToDatabase(tc.config)
+			require.NoError(t, err)
+
+			if tc.seedDB != nil {
+				require.NoError(t, tc.seedDB())
 			}
 
-			if test.seedDB != nil {
-				err = test.seedDB()
-				if err != nil {
-					t.Error(err)
-				}
-			}
-
-			err = InsertMany(testExchanges)
-			if err != nil {
-				t.Fatal(err)
-			}
+			require.NoError(t, InsertMany(testExchanges))
 
 			err = testhelpers.CloseDatabase(dbConn)
-			if err != nil {
-				t.Error(err)
-			}
+			assert.NoError(t, err)
 		})
 	}
 }
 
 func TestOneAndOneByUUID(t *testing.T) {
-	testCases := []struct {
+	for _, tc := range []struct {
 		name   string
 		config *database.Config
 		seedDB func() error
@@ -131,45 +121,27 @@ func TestOneAndOneByUUID(t *testing.T) {
 			},
 			seedDB: seed,
 		},
-	}
-
-	for x := range testCases {
-		test := testCases[x]
-
-		t.Run(test.name, func(t *testing.T) {
-			if !testhelpers.CheckValidConfig(&test.config.ConnectionDetails) {
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			if !testhelpers.CheckValidConfig(&tc.config.ConnectionDetails) {
 				t.Skip("database not configured skipping test")
 			}
 
-			dbConn, err := testhelpers.ConnectToDatabase(test.config)
-			if err != nil {
-				t.Fatal(err)
-			}
+			dbConn, err := testhelpers.ConnectToDatabase(tc.config)
+			require.NoError(t, err)
 
-			if test.seedDB != nil {
-				err = test.seedDB()
-				if err != nil {
-					t.Error(err)
-				}
+			if tc.seedDB != nil {
+				require.NoError(t, tc.seedDB())
 			}
 
 			ret, err := One("one")
-			if err != nil {
-				t.Fatal(err)
-			}
+			require.NoError(t, err)
 
 			ret2, err := OneByUUID(ret.UUID)
-			if err != nil {
-				t.Fatal(err)
-			}
+			require.NoError(t, err)
 
-			if ret.Name != ret2.Name {
-				t.Fatalf("unexpected value received: %v", ret2.Name)
-			}
-			err = testhelpers.CloseDatabase(dbConn)
-			if err != nil {
-				t.Error(err)
-			}
+			assert.Equal(t, ret.Name, ret2.Name)
+			assert.NoError(t, testhelpers.CloseDatabase(dbConn))
 		})
 	}
 }