refactor: replace InactiveRegionManager with RegionLeaseKeeper

[WenyXu]

I hereby agree to the terms of the GreptimeDB CLA

What's changed and what's your intention?

1. Replace InactiveRegionManager with RegionLeaseKeeper
2. Remove InactiveRegionManager

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.

Refer to a related PR or issue link (optional)

#2700
close #2636

[codecov]

Codecov Report

Merging #2729 (f0072f2) into develop (22ee45f) will decrease coverage by 85.24%.
Report is 5 commits behind head on develop.
The diff coverage is n/a.

❗ Current head f0072f2 differs from pull request most recent head 1be73d8. Consider uploading reports for the commit 1be73d8 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #2729       +/-   ##
===========================================
- Coverage    85.23%       0   -85.24%     
===========================================
  Files          765       0      -765     
  Lines       124178       0   -124178     
===========================================
- Hits        105842       0   -105842     
+ Misses       18336       0    -18336     

[fengjiachun]

LGTM