Fully Automate New Chain Checks

[nlordell]

Currently, there is a manual step of running new chain checks (bash bin/github-review.sh) for new issues. This can be automated and run in CI to reduce the manual checks needed by the protocol team when merging new chains.

The expected outcome is a new GitHub action that runs on new chain PRs and checks that implements all the checks from the GitHub review script. In addition, some further automation is required:

• We could fetch the version, chain id and rpc from the PR.
• If there are changes in any other path other than src/assets, the script should show an error
• We should ensure there are not more than a single chain ID being added in a PR

[remedcu]

Fixed in #683