fix: could not get transaction hash for sequencer transactions

[antazoey]

What I did

The transaction hash was missing for sequencer transactions.
Also, OP stack custom networks was under-documented.

How I did it

How to verify it

Checklist

• Passes all linting checks (pre-commit and CI jobs)
• New test cases have been added and are passing
• Documentation has been updated
• PR title follows Conventional Commit standard (will be automatically included in the changelog)

[antazoey]

@fubuloubu What other benefits can we include in the plugin?

[fubuloubu]

In terms of docs what we currently have, think we have that covered nicely

In terms of ideas, some ideas:

• track L1 block confirmations
• do native bridge actions (there are other bridge types):
  • L1 -> L2 deposits of supported tokens e.g. ETH
  • L2 -> L1 withdrawals (which take 7 days)
• they also have some native "pre-compiles" that come out of the box w/ OP stack chains

[bitwise-constructs]

Helpful documentation added to this too, lgtm