Support all types in Packet Read / Write for Source Generator

[valkyrienyanko]

The following types need to be implemented:

• Dictionary
• List
• Array
• Class

All of the above types are actually already implemented in PacketReader.cs using reflection. We just need to convert this code to the source generator to remove all the reflection.

The following types are currently supported:

Relevant scripts:

• https://github.com/CSharpGodotTools/PacketGen/blob/main/PacketReadWriteMethodsGenerator.cs
• https://github.com/CSharpGodotTools/Framework/blob/f667ec21eb4a0b253d475c897fd025b51b94c334/Netcode/Packet/PacketReader.cs

[valkyrienyanko]

Recursive Dictionary and List are now implemented and support all primitive and generic type arguments.

So for example Dictionary<List<int>, Dictionary<string, char>> should work.

The following types are not supported yet:

• Class
• Array
• HashSet
• And the many other types in C#

There has to be a better way of always checking the Name property of the INamedTypeSymbol. I don't think I'm suppose to check each individual type. E.g.: List, Dictionary, HashSet.