[PM-7014] Track MessagePack fork and turn off CI / recurring workflows (#3456)

* Remove messagepack submodule

* Migrate MessagePack fork to this repo

* Disable build CI

* Disable Renovate

* Disable Crowdin recurring job

* Address workflow linter errors

lib/MessagePack/MessagePack.playground/Contents.swift

@@ -0,0 +1,13 @@
+import MessagePack
+
+let encoder = MessagePackEncoder()
+
+let value: String = "hello"
+let encodedData = try encoder.encode(value)
+
+print("Bytes: ", encodedData.map{ String($0, radix: 16, uppercase: true) })
+
+let decoder = MessagePackDecoder()
+let decodedValue = try decoder.decode(String.self, from: encodedData)
+
+decodedValue == value

lib/MessagePack/MessagePack.playground/contents.xcplayground

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<playground version='5.0' target-platform='macos' executeOnSourceChanges='false'>
+    <timeline fileName='timeline.xctimeline'/>
+</playground>