feat: add information_schema.files

[dimbtp]

I hereby agree to the terms of the GreptimeDB CLA

What's changed and what's your intention?

• add information_schema.files table

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR does not require documentation updates.

Refer to a related PR or issue link (optional)

#2931

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (41e51d4) 85.40% compared to head (970759f) 84.92%.
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3054      +/-   ##
==========================================
- Coverage   85.40%   84.92%   -0.49%     
==========================================
  Files         795      799       +4     
  Lines      128717   129074     +357     
==========================================
- Hits       109935   109617     -318     
- Misses      18782    19457     +675     

[killme2008]

@dimbtp Thanks for your contribution. Could you run the sqlness by cargo run --bin sqlness-runner to update the tests/cases/standalone/common/system/information_schema.result and commit it too?

[killme2008]

Thank you very much. A little question about extra field. Almost LGTM.