refactor: use submodules for contracts

[zimpha]

Purpose or design rationale of this PR

This PR remove contracts directory and add scroll-contracts repo ad submodule.

Q: Why not reuse contracts directory for the submodule?
A: It contains submodules before, changing it to another submodule would lead some problems in git.

PR title

Your PR title must follow conventional commits (as we are doing squash merge for each PR), so it must start with one of the following types:

• refactor: A code change that doesn't fix a bug, or add a feature, or improves performance

Deployment tag versioning

Has tag in common/version.go been updated or have you added bump-version label to this PR?

• No, this PR doesn't involve a new deployment, git tag, docker image tag
• Yes

Breaking change label

Does this PR have the breaking-change label?

• No, this PR is not a breaking change
• Yes

[georgehao]

How about don't put submoudle to monorepo, also remove l2geth submodule @Thegaram @HAOYUatHZ

[Thegaram]

How about don't put submoudle to monorepo, also remove l2geth submodule @Thegaram @HAOYUatHZ

Sounds good to me. I'm fine with removing it. But as I recall a few integration tests are using it. (Maybe it's fine to remove those.)

[zimpha]

How about don't put submoudle to monorepo, also remove l2geth submodule @Thegaram @HAOYUatHZ

Sounds good to me. I'm fine with removing it. But as I recall a few integration tests are using it. (Maybe it's fine to remove those.)

agreed.

[0xmountaintop]

How about don't put submoudle to monorepo, also remove l2geth submodule @Thegaram @HAOYUatHZ

ok

[colinlyguo]

Reopen this PR, we will still use codec implementations to check the workflow (mainly hash calculation) in infra components.

These hash checks are minimum requirements for merging new features, it can at least align contract and infra components to some extent.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 54.31%. Comparing base (16673e2) to head (4fec94b).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1396   +/-   ##
========================================
  Coverage    54.31%   54.31%           
========================================
  Files          156      156           
  Lines        11918    11918           
========================================
  Hits          6473     6473           
  Misses        4950     4950           
  Partials       495      495           

Flag	Coverage Δ
rollup	59.83% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.