Deprecate l2geth TODO list

[yiweichi]

TODO list during we deprecate l2geth:

1. Switch signer on RN, this will stop RN from serving signature for both eth-wire block broadcast and eth66 serve block request. This will pervent l2geth from syncing any new blocks.

TODO list after we deprecated l2geth:

1. clean up codebases.

• Reth side:

  • revert changes on get_headers_response here
  • remove passing request_header_transform to EthRequestHandler here
  • revert changes to trait HeaderResponseTransform from async to sync here.

• rollup-node side:

  • drop table database block_signature here
  • remove database operation insert_signature and get_signature here.
  • remove database model block_signature here.
  • stop persisting block signature when receiving a new block from the network here.
  • stop persisting block signature when sequencing a new block here.
  • remove logic that handles eth_wire protocol block broadcast here and here.
  • remove hardcoded signer addresses here, and related args here.
  • revert changes on ScrollHeaderTransform here, so we don't persist block signature during backfill.
  • remove the whole structure ScrollRequestHeaderTransform here.

2. drop database table block_signature

3. deploy new version of RN