Map time resolution

[lixiliu]

Addresses Issue #30
Mapping time resolution is defined by the time resolution in time_config as well as the optional param resampling_operation into the mapper function.

Aggregation types:

Disaggregation types:

Interpolation mapping from hourly to 20-min:

A note on NA values in interpolation:

• If one of the two row values used in the interpolation is NA, duckdb seems to treat that NA value as 0 and the interpolated value is non NA.

• If both values are NA, then the result is NA.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 88.75000% with 27 lines in your changes missing coverage. Please review.

Project coverage is 91.15%. Comparing base (0e01be0) to head (c960f58).

Files with missing lines	Patch %	Lines
src/chronify/time_series_mapper_datetime.py	90.16%	12 Missing ⚠️
src/chronify/time_utils.py	60.00%	6 Missing ⚠️
tests/test_store.py	90.90%	5 Missing ⚠️
src/chronify/time_series_mapper_base.py	89.28%	3 Missing ⚠️
src/chronify/time_series_mapper_index_time.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
- Coverage   91.24%   91.15%   -0.10%     
==========================================
  Files          44       44              
  Lines        3335     3549     +214     
==========================================
+ Hits         3043     3235     +192     
- Misses        292      314      +22     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.