chore: paginated query region stats

[fengjiachun]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

What's changed and what's your intention?

The list_region_stats function is being required by more modules, and I am concerned that its range query may become a bottleneck in a large cluster because DatanodeStats, which is the queried value, is quite large. This PR implements pagination for the query.

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.

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[codecov]

Codecov Report

Attention: Patch coverage is 30.95238% with 29 lines in your changes missing coverage. Please review.

Project coverage is 83.89%. Comparing base (a8b426a) to head (45cff88).
Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4942      +/-   ##
==========================================
- Coverage   84.13%   83.89%   -0.25%     
==========================================
  Files        1141     1141              
  Lines      211207   211098     -109     
==========================================
- Hits       177701   177095     -606     
- Misses      33506    34003     +497