chore: move 'utils/rules.ts' to 'rules/index.ts'

[Foxeye-Rinx]

• The lib/load-rules.ts file is confusing because it behaves like an index file for the src/rules folder, so adding a comment helps clarify its purpose.
• Rename tools/update-rules.ts to tools/update-rules-index.ts.
• Move utils/rules.ts to rules/index.ts

Motivation:

• The first time I saw utils/rules.ts, it was a bit confusing because its behavior is more like an index file for src/rules than a utility.
• lib/load-rules.ts same as above.
• Making it an index file and placing it in src/rules makes its purpose clearer.

Potential enhancement (later):

• Write the original design to the doc under Contributing guidelines section

Need help to review:

• I don't understand why there is a js import here, the file is a ts file, so I don't know if this change breaks it or not
• I tried npm run test and it went well

[changeset-bot]

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[ota-meshi]

The changes in this PR are LGTM! Thank you!