[Go] Working on a go example plus fixing go grpc code (#6448)

Implemented server.go and half implemented client.go

Finishes implementation for greeter go example

Update grpc code for monster.fbs

Adds a couple of cpp methods

Adhere to gofmt standards

Adds a readme for issues with grpc

grpc/examples/go/greeter/models/HelloReply.go

@@ -0,0 +1,52 @@
+// Code generated by the FlatBuffers compiler. DO NOT EDIT.
+
+package models
+
+import (
+	flatbuffers "github.com/google/flatbuffers/go"
+)
+
+type HelloReply struct {
+	_tab flatbuffers.Table
+}
+
+func GetRootAsHelloReply(buf []byte, offset flatbuffers.UOffsetT) *HelloReply {
+	n := flatbuffers.GetUOffsetT(buf[offset:])
+	x := &HelloReply{}
+	x.Init(buf, n+offset)
+	return x
+}
+
+func GetSizePrefixedRootAsHelloReply(buf []byte, offset flatbuffers.UOffsetT) *HelloReply {
+	n := flatbuffers.GetUOffsetT(buf[offset+flatbuffers.SizeUint32:])
+	x := &HelloReply{}
+	x.Init(buf, n+offset+flatbuffers.SizeUint32)
+	return x
+}
+
+func (rcv *HelloReply) Init(buf []byte, i flatbuffers.UOffsetT) {
+	rcv._tab.Bytes = buf
+	rcv._tab.Pos = i
+}
+
+func (rcv *HelloReply) Table() flatbuffers.Table {
+	return rcv._tab
+}
+
+func (rcv *HelloReply) Message() []byte {
+	o := flatbuffers.UOffsetT(rcv._tab.Offset(4))
+	if o != 0 {
+		return rcv._tab.ByteVector(o + rcv._tab.Pos)
+	}
+	return nil
+}
+
+func HelloReplyStart(builder *flatbuffers.Builder) {
+	builder.StartObject(1)
+}
+func HelloReplyAddMessage(builder *flatbuffers.Builder, message flatbuffers.UOffsetT) {
+	builder.PrependUOffsetTSlot(0, flatbuffers.UOffsetT(message), 0)
+}
+func HelloReplyEnd(builder *flatbuffers.Builder) flatbuffers.UOffsetT {
+	return builder.EndObject()
+}