Port to 1.21.2 (#171)

* Update JSON Files to 1.21.2

* Update constants to 1.21.2

* Port c_login_success to 1.21.2

* Fix: damage type

* Overhaul Packet ID system

We now use Packet IDS from enums.

1. This is very very nice for seeing which Packets are already implemented and which not.
2. This lets us easly port to newer Minecraft version, In vanilla there are no Packet ids hardcoded, Packet IDs will be parsed from a enum like this

* Port all Packets to 1.20.2

* Update README badge to 1.20.2

* Change doc for the new packet id system

README.md

@@ -5,7 +5,7 @@
 ![CI](https://github.com/Snowiiii/Pumpkin/actions/workflows/rust.yml/badge.svg)
 [![Discord](https://img.shields.io/discord/1268592337445978193.svg?label=&logo=discord&logoColor=ffffff&color=7389D8&labelColor=6A7EC2)](https://discord.gg/wT8XjrjKkf)
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
-![Current version)](https://img.shields.io/badge/current_version-1.21.1-blue)
+![Current version)](https://img.shields.io/badge/current_version-1.21.2-blue)
 
 </div>