fix: Added support for byte on NetworkVariable through codegen

[Ufabsther]

the codegen wasn't picking byte - it's because a variable of a type other than NetworkVariable<byte> (such as NetworkVariable<FixedString32Bytes>) is serializing a byte value as part of its delta serialization. Delta serialization was added in NGO 1.9, which is why it doesn't happen in previous versions. This code assumes the existence of a byte serializer, but if the user doesn't have a NetworkVariable in their code, the byte serializer won't be initialized by the codegen pass.

fix: #2920

Changelog

• Fixed: Issue where internal delta serialization could not have a byte serializer defined when serializing deltas for other types. Added [GenerateSerializationForType(typeof(byte))] to both the NetworkVariable and AnticipatedNetworkVariable classes to assure a byte serializer is defined.

Testing and Documentation

• No tests were added or updated.
• No documentation changes or additions were necessary.

[unity-cla-assistant]

All committers have signed the CLA.

[Ufabsther]

@Unity-Technologies/multiplayer-sdk I'm part of Unity, could you MP a proper way to fix the CLA situation