replace dep with go modules (#16017)

- guide shamelessly stolen from prometheus/prometheus
- updates local interface of oauth exchange
- updates local impl of hclogger
- bump jaeger client version

closes #16088

vendor/github.com/go-sql-driver/mysql/utils_go18.go

@@ -15,6 +15,7 @@ import (
 	"database/sql"
 	"database/sql/driver"
 	"errors"
+	"fmt"
 )
 
 func cloneTLSConfig(c *tls.Config) *tls.Config {
@@ -44,6 +45,6 @@ func mapIsolationLevel(level driver.IsolationLevel) (string, error) {
 	case sql.LevelSerializable:
 		return "SERIALIZABLE", nil
 	default:
-		return "", errors.New("mysql: unsupported isolation level: " + string(level))
+		return "", fmt.Errorf("mysql: unsupported isolation level: %v", level)
 	}
 }