Fix rpc doc generator issues

[chenyukang]

What problem does this PR solve?

There are several issues:

• Uint32 is wrong and replaced with AlertId
• Missing some fields, such as IndexerSearchKeyFilter, cc @EthanYuan

What is changed and how it works?

What's Changed:

• Fix issues in gen.rs
• Add some predefined types in the doc generator, similar with rpc.py

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

None: Exclude this PR from the release note.