Add time lag analysis helpers

[wtbarnes]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 46.15385% with 56 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.94%. Comparing base (95df5b5) to head (10799ed).

Files with missing lines	Patch %	Lines
synthesizAR/analysis/time_lag/time_lag.py	32.50%	27 Missing ⚠️
synthesizAR/instruments/sdo.py	45.00%	11 Missing ⚠️
synthesizAR/analysis/time_lag/map_sources.py	62.96%	10 Missing ⚠️
synthesizAR/instruments/util.py	33.33%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #109      +/-   ##
==========================================
- Coverage   61.67%   60.94%   -0.73%     
==========================================
  Files          43       47       +4     
  Lines        2239     2338      +99     
==========================================
+ Hits         1381     1425      +44     
- Misses        858      913      +55     

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