New 'Ethereum JSONRPC' client implementation

[goran-ethernal]

Description

This PR implements a new Ethereum JSONRPC client in the jsonrpc package in blade.

Goals behind this PR

1. We need a client that can use the types from blade like types.Transaction, types.Receipt, types.Header, types.TxAccessList, etc.
2. To have our own implementation we can modify and expand as needs arise.
3. So it can be used with blade txn signers.

What was done in PR

1. Implemented new json rpc client EthClient in jsonrpc package.
2. Add e2e test for each of its functions.
3. Added JSON unmarshalling for our types like Transaction, Block, Header, Receipt, Log, AccessList, and each inner transaction type, since we have functions that returned json marshalled types (eth_getBlockByNumber, eth_getTransactionByHash, eth_getTransactionReceipt, etc.).
4. Added our own CallMsg implementation for eth_call endpoint.
5. Reorganized code a bit.
6. Removed unused functions that lint and static analysis reported.

Changes include

• Bugfix (non-breaking change that solves an issue)
• Hotfix (change that solves an urgent issue, and requires immediate attention)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)

Checklist

• I have assigned this PR to myself
• I have added at least 1 reviewer
• I have added the relevant labels
• I have updated the official documentation
• I have added sufficient documentation in code

Testing

• I have tested this code with the official test suite
• I have tested this code manually