Add openrpc generator and use JsonSchema to update rpc/readme

[chenyukang]

What problem does this PR solve?

Issue Number: close #4149

Problem Summary:
Our old way of using rpc.py to generate document has some compatibility issues, we may need to tweak it when updating to a new version of rustc, since the format for HTML from cargo doc may change.

This PR introduce a way to use JsonSchema to generated PRC document.

What is changed and how it works?

• Add derive JsonSchema for data structures used by rpc
• Add ckb-rpc-gen to generate rpc/README.md
• Support dump openrpc specs for better dev experience
• There is a bug from schemars, we may need to contribute the patch to upstream, before that we need to use a patched version.

What's Changed:

Related changes

• PR to update owner/repo:
• Need to cherry-pick to the release branch

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code ci-runs-only: [ quick_checks,linters ]

Side effects

• Performance regression
• Breaking backward compatibility

Release note

Title Only: Include only the PR title in the release note.