Add PointsInTimeSeries class and integrate with SampleSeries

[tombonfert]

Summary

• Introduced the PointsInTimeSeries class to represent time series data with values defined at specific timestamps.
• Updated the SampleSeries class to support filtering based on PointsInTime, returning a PointsInTimeSeries when applicable.
• Enhanced the init.py file to include the new PointsInTimeSeries class.
• Added unit tests for PointsInTimeSeries and updated existing tests to validate new functionality.
• Ensured compatibility with existing series types and improved overall functionality in time series operations.

Changes

Test Plan

• Unit tests added/updated
• Manual testing completed
• Documentation updated (if applicable)

Checklist

• Code follows project style guidelines
• Self-review completed
• No new linter warnings introduced

[codecov]

Codecov Report

❌ Patch coverage is 91.41104% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.54%. Comparing base (fcd65ca) to head (ba55240).

Files with missing lines	Patch %	Lines
...query_engine/model/series/points_in_time_series.py	91.02%	12 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #45      +/-   ##
==========================================
+ Coverage   86.35%   86.54%   +0.18%     
==========================================
  Files          52       53       +1     
  Lines        4229     4391     +162     
  Branches      507      528      +21     
==========================================
+ Hits         3652     3800     +148     
- Misses        479      491      +12     
- Partials       98      100       +2     

Files with missing lines	Coverage Δ
...impulse_query_engine/model/series/sample_series.py	84.66% <100.00%> (+0.21%)	⬆️
...query_engine/model/series/points_in_time_series.py	91.02% <91.02%> (ø)

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