Add Factories for JSON+SimpleJSON Serializers

Summary:
Thrift structs don't neccessarirly always stay within RPC. Programs might
be interested in outputting them to a user / saving them to a DB.
Here, JSON (DB) SimpleJSON (User) serialization formats may be useful.

This Diff adds factories for both serialization formats.

Reviewed By: lcpoletto, doranand

Differential Revision: D38783343

fbshipit-source-id: cdb635dac21ddb954b09ece28bc1296476a5c862

Author: laurenzfg

thrift/lib/go/thrift/serializer.go

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) Facebook, Inc. and its affiliates.
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -61,6 +61,22 @@ func NewCompactSerializer() *Serializer {
 	return &Serializer{transport, protocol}
 }
 
+// NewJSONSerializer creates a new serializer using the JSON protocol
+func NewJSONSerializer() *Serializer {
+	transport := NewMemoryBufferLen(1024)
+	protocol := NewJSONProtocolFactory().GetProtocol(transport)
+
+	return &Serializer{transport, protocol}
+}
+
+// NewSimpleJSONSerializer creates a new serializer using the SimpleJSON protocol
+func NewSimpleJSONSerializer() *Serializer {
+	transport := NewMemoryBufferLen(1024)
+	protocol := NewSimpleJSONProtocolFactory().GetProtocol(transport)
+
+	return &Serializer{transport, protocol}
+}
+
 // WriteString writes msg to the serializer and returns it as a string
 func (s *Serializer) WriteString(msg Struct) (str string, err error) {
 	s.Transport.Reset()