Time inconsistencies heuristic for faulty measurements detection

[LDiazN]

Implements an airflow dag that flags measurements with timestamp anomalies

closes #146

[codecov]

Codecov Report

❌ Patch coverage is 97.45763% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.64%. Comparing base (e70e168) to head (32903ce).
⚠️ Report is 32 commits behind head on main.

Files with missing lines	Patch %	Lines
...ine/src/oonipipeline/tasks/time_inconsistencies.py	87.50%	2 Missing ⚠️
oonipipeline/src/oonipipeline/tasks/volume.py	86.66%	2 Missing ⚠️
oonipipeline/tests/conftest.py	92.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #147      +/-   ##
==========================================
+ Coverage   82.77%   83.64%   +0.86%     
==========================================
  Files          78       84       +6     
  Lines        4871     5104     +233     
==========================================
+ Hits         4032     4269     +237     
+ Misses        839      835       -4     

Flag	Coverage Δ
oonidata	77.86% <ø> (ø)
oonipipeline	87.17% <97.45%> (+1.15%)	⬆️

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[hellais]

This PR looks good. Left a comment for what to improve in the threshold checks for measurements from time travelers

[hellais]

Left some comments for improvements. I think it's ok for us either deploying as-is and documenting this as future improvements or applying it pre-deploy

[hellais]

LGTM