Etherlink/Tezt: Rpc tezt test on eth_blockNumber, eth_getTransactionByHash, net_version, eth_getCode

Context

This MR introduces 4 new tezt tests for etherlink (4 * 2 exactly, one for proxy and the other one for the sequencer)

Manually testing the MR

dune exec tezt/tests/main.exe -- --file evm_rollup.ml evm rpc net_version
dune exec tezt/tests/main.exe -- --file evm_rollup.ml evm rpc get_code
dune exec tezt/tests/main.exe -- --file evm_rollup.ml evm rpc block_number
dune exec tezt/tests/main.exe -- --file evm_rollup.ml evm rpc transaction_by_hash

Checklist

• Document the interface of any function added or modified (see the coding guidelines)
• Document any change to the user interface, including configuration parameters (see node configuration)
• Provide automatic testing (see the testing guide).
• For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
• Select suitable reviewers using the Reviewers field below.
• Select as Assignee the next person who should take action on that MR