Fix that load tsfile may skip time-only aligned chunks

[jt2594838]

For time-only aligned chunk:

1. the current pageIndex2ChunkData is cleared after calling storeTimeChunkContext;
2. pageIndex2ChunkData will not be set restored becauses there is no value chunk to call switchToTimeChunkContextOfCurrentMeasurement

The result is that the time-only chunk is ignored because pageIndex2ChunkData is empty.

In this PR, the pageIndex2ChunkData is not cleared in storeTimeChunkContext, but a new one is created in processTimeChunkOrNonAlignedChunk.
Therefore, when calling consumeAllAlignedChunkData, the time-only chunk is still preserved.

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

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

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 40.24%. Comparing base (acaabb8) to head (ce979f2).
⚠️ Report is 53 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #17625      +/-   ##
============================================
+ Coverage     39.80%   40.24%   +0.43%     
- Complexity      312     2554    +2242     
============================================
  Files          5142     5177      +35     
  Lines        347882   348881     +999     
  Branches      44404    44625     +221     
============================================
+ Hits         138489   140391    +1902     
+ Misses       209393   208490     -903     

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