feat(devnet): Add commands for setting up localnet ENV file

[RomanHodulak]

Ticket

• Related Linear Ticket: SEQ-210

What does this PR do?

• Summary: Adds commands that generate localnet.env with all needed values
• Key Changes:
  • Extracts contract address from the file created by deploying contracts to devnet

Does this PR introduce any breaking changes (API/schema)?

• No

Do any environment variables need to be updated or added before deployment?

• No

How can this PR be tested?

just -f .devcontainer/justfile op-up
just -f .devcontainer/justfile op-update-chain-address
cargo make interceptor

[linear]

SEQ-210 Integration testing via dev container

When SEQ-175 is mostly complete and the full stack is stood up with all parts communicating successfully, we need to test that the sequencer's send_raw_transaction() flow.

AC

• Stand up dev container and submit an L3 transaction to the sequencer. Transaction should be forwarded to the L2 smart contract
  • Variations on the L3 txn including edge cases and large ones that need to be chunked up
• (Nice to have) Crystallize the above with a CI test - dependent on SEQ-140

[RomanHodulak]

Superseded by #36 (switched issue ID)