OP Superchain: local views for chains in the cluster

[tom2drum]

Description and Related Issue(s)

This is the continuation of the #2786 pull request and resolves #2827 issue.

Proposed changes

• Added local views for main entities in the explorer, including transactions, blocks, and addresses.
• Added placeholder components for pages and snippets that depend on data from multichain aggregator services. I could not implement them fully as the API is still a work in progress.
• Styled the home page.
• Introduced factories and guards for the getServerSideProps function (see refactor getServerSideProps) to allow reusing their logic in the multichain explorer setup.
• Added a fetcher to retrieve cluster configuration from the microservice API.

Additional information

This feature is not production-ready; therefore, none of the new environment variables are documented and are subject to change in the future. Some views and pages are still works in progress and may serve as placeholders or be broken. The implemented views may contain bugs or exhibit broken behavior, which will be addressed in future pull requests.

Checklist for PR author

• I have tested these changes locally.
• I added tests to cover any new functionality, following this guide
• Whenever I fix a bug, I include a regression test to ensure that the bug does not reappear silently.
• If I have added, changed, renamed, or removed an environment variable
  • I updated the list of environment variables in the documentation
  • I made the necessary changes to the validator script according to the guide
  • I added "ENVs" label to this pull request