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/inconshreveable/log15/format.go

@@ -39,7 +39,7 @@ func (f formatFunc) Format(r *Record) []byte {
 // a terminal with color-coded level output and terser human friendly timestamp.
 // This format should only be used for interactive programs or while developing.
 //
-//     [TIME] [LEVEL] MESAGE key=value key=value ...
+//     [TIME] [LEVEL] MESSAGE key=value key=value ...
 //
 // Example:
 //
@@ -195,9 +195,12 @@ func formatShared(value interface{}) (result interface{}) {
 
 func formatJSONValue(value interface{}) interface{} {
 	value = formatShared(value)
+
 	switch value.(type) {
 	case int, int8, int16, int32, int64, float32, float64, uint, uint8, uint16, uint32, uint64, string:
 		return value
+	case interface{}, map[string]interface{}, []interface{}:
+		return value
 	default:
 		return fmt.Sprintf("%+v", value)
 	}