feat: Align metrics

[Pringled]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 87.25490% with 13 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
vicinity/backends/annoy.py	83.33%	3 Missing ⚠️
vicinity/backends/pynndescent.py	78.57%	3 Missing ⚠️
vicinity/backends/faiss.py	88.88%	2 Missing ⚠️
vicinity/backends/usearch.py	81.81%	2 Missing ⚠️
vicinity/utils.py	90.00%	2 Missing ⚠️
vicinity/backends/hnsw.py	91.66%	1 Missing ⚠️

Files with missing lines	Coverage Δ
vicinity/__init__.py	100.00% <100.00%> (ø)
vicinity/backends/base.py	84.37% <100.00%> (+1.32%)	⬆️
vicinity/backends/basic.py	78.12% <100.00%> (-12.20%)	⬇️
vicinity/backends/hnsw.py	95.31% <91.66%> (-2.97%)	⬇️
vicinity/backends/faiss.py	94.91% <88.88%> (ø)
vicinity/backends/usearch.py	96.92% <81.81%> (ø)
vicinity/utils.py	95.74% <90.00%> (-4.26%)	⬇️
vicinity/backends/annoy.py	95.06% <83.33%> (+0.12%)	⬆️
vicinity/backends/pynndescent.py	95.65% <78.57%> (-1.13%)	⬇️

... and 1 file with indirect coverage changes

[stephantul]

LGTM, I think the exceptions to the inverse mapping from metric to string can be set in the respective backends, but that's not a blocker for me.

e.g.,

class Backend:

     inverse_metric_mapping = {Metric.EUCLIDEAN: "l2"}

You can then find a generalizable solution in the form of a method on the base class:

def _map_metric_to_string(self, metric: Metric) -> str:
     return self.inverse_metric_mapping.get(metric, metric.value)