feat(rpc): Add encode/decode to state diff field

[antiyro]

feat: Implement Encode/Decode Trait for StateDiff Field

A new StateDiff field has been introduced in InvokeTransactionTrace, DeployAccountTransactionTrace, L1HandlerTransactionTrace, and DeclareTransactionTrace to address issue #1313.

Currently, this field lacks the implementation of the encode/decode trait, which is essential for its correct integration into the respective structures. This deficiency is highlighted by the following error:

the trait bound `[starknet_core::types::StateDiff]: Encode` is not satisfied

To resolve this, a comprehensive implementation of the StateDiff with encodable and decodable components is necessary. This implementation should adhere to the established schema in starknet-rs, thereby aligning with the JSON-RPC specifications.

[antiyro]

I'm taking this one

[antiyro]

Closing this issue as it is solved here: 5641578 and about to be merged here #1313

[antiyro]

Note that this issue is linked to this one: #1331