Feature/SampledCoordinate + Refactoring

[atrabattoni]

Adds a new SampledCoordinate coordinate type with fixed sampling interval.

This coordinate types is more similar to what used in seismology: one unique sampling rate, several starts associated with number of continuous points.

| S1 - - - - - - - | S2 - - - - | S3 - - - - - - - - - - - - |
         N1              N2                    N3
Delta = -

This new coordinate type is closer to the original data layout, have a better defined unique sampling interval but does not natively deals with gaps and overlaps. Those are determined a posteriori using a given tolerance.

This PR make some important refactoring of the Coordinate part by making defining a clearer API that every coordinate type must follow

InterpCoordinated is still the default for now, but the user can chose to try this coordinate system by using the ctype kwarg:

xd.open_dataarray("path", engine="format", ctype={"time": "sampled", "distance": interpolated"})

TODO:

• Code
• Tests
• Docs
• Release note entry

[codecov]

Codecov Report

❌ Patch coverage is 88.77375% with 130 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.21%. Comparing base (3ffb6be) to head (0ebb613).

Files with missing lines	Patch %	Lines
xdas/coordinates/default.py	46.26%	36 Missing ⚠️
xdas/coordinates/core.py	91.07%	29 Missing ⚠️
xdas/coordinates/interp.py	93.80%	15 Missing ⚠️
xdas/coordinates/dense.py	82.85%	12 Missing ⚠️
xdas/io/core.py	11.11%	8 Missing ⚠️
xdas/io/febus.py	40.00%	6 Missing ⚠️
xdas/io/apsensing.py	42.85%	4 Missing ⚠️
xdas/io/terra15.py	42.85%	4 Missing ⚠️
xdas/coordinates/scalar.py	92.50%	3 Missing ⚠️
xdas/io/asn.py	62.50%	3 Missing ⚠️
... and 4 more

Additional details and impacted files

@@            Coverage Diff             @@
##              dev      #53      +/-   ##
==========================================
+ Coverage   81.91%   83.21%   +1.29%     
==========================================
  Files          37       43       +6     
  Lines        4170     4564     +394     
==========================================
+ Hits         3416     3798     +382     
- Misses        754      766      +12     

☔ 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.