feat/starknet_getClassAt

[antiyro]

Issue: Implement starknet_getClassAt RPC Call

Description:
The starknet_getClassAt RPC call has been implemented but requires further testing and verification against the entire state. This RPC call retrieves the contract class definition in the given block at the specified address.

Parameters:

• block_id: The hash of the requested block, or number (height) of the requested block, or a block tag. This parameter is required.
• contract_address: The address of the contract whose class definition will be returned. This parameter is required.

Expected Result:
The contract class definition for the given address in the specified block. The result can be:

1. Deprecated contract class
2. Contract class

Potential Errors:

• BLOCK_NOT_FOUND: The specified block could not be found.
• CONTRACT_NOT_FOUND: The specified contract could not be found.

Testing:
Initial testings can be found here. However, these should not be considered complete and improvements are welcome.

Resources:

• Alchemy RPC API Endpoint Documentation
• Starknet API OpenRPC Spec

Comments:
Please comment below for coordination.

[github-actions]

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Because this issue is marked as stale, it will be closed and locked in 7 days if no further activity occurs.
Thank you for your contributions!

[github-actions]

There hasn't been any activity on this issue recently, and in order to prioritize active issues, it will be marked as stale.
Please make sure to update to the latest version and check if that solves the issue. Let us know if that works for you by leaving a 👍
Because this issue is marked as stale, it will be closed and locked in 7 days if no further activity occurs.
Thank you for your contributions!