Change FileTimeIndexCache to region level

[HTHou]

Description

FileTimeIndexCache may open too much file if there is too much time partitions.

[codecov]

Codecov Report

Attention: Patch coverage is 44.00000% with 42 lines in your changes missing coverage. Please review.

Project coverage is 40.98%. Comparing base (c547916) to head (4a15df7).
Report is 14 commits behind head on master.

Files with missing lines	Patch %	Lines
...n/tsfile/timeindex/FileTimeIndexCacheRecorder.java	32.50%	27 Missing ⚠️
.../iotdb/db/storageengine/dataregion/DataRegion.java	52.00%	12 Missing ⚠️
...s/fileTimeIndexCache/FileTimeIndexCacheReader.java	0.00%	2 Missing ⚠️
...storageengine/dataregion/tsfile/TsFileManager.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #13353   +/-   ##
=========================================
  Coverage     40.97%   40.98%           
  Complexity       71       71           
=========================================
  Files          3929     3929           
  Lines        242315   242308    -7     
  Branches      29251    29248    -3     
=========================================
+ Hits          99296    99308   +12     
+ Misses       143019   143000   -19     

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[sonarqubecloud]

Quality Gate passed

Issues
3 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[jt2594838]

Add a comment to explain that the key is the data region id.

[jt2594838]

One potential improvement: the compaction task clears the cache file at first. If a restart happens at that time, there will be no available cache file for this restart, and the system may suffer from a long restart time.
Maybe it would be better to adopt the write-a-temp-file-and-replace method.