feat: convert block hash to number

[ICavlek]

Updated check of requested block hash in resolve_block_by_id function

• Request of block by hash is checked by it's number representation
• Block root value is returned because of the proof validation
• Necessary changes in request of block by number

Unit tests for resolve_block_by_id function

• Test environment - Mock server for Starknet with custom response, state of Helios client
• User inputs of desired block and check with the response

Update of integration tests in tests/rpc.rs

• Additional requests by block hash and tag in test_getStorageAt

[sergey-melnychuk]

LGTM