Add bvh for generate_sdf method

[Azkellas]

generate_sdf now takes a AccelerationMethod parameter, that can be either AccelerationMethod::Bvh (default) or AccelerationMethod::None.

Bvh is recommended unless you're really tight on memory or your query is very small (couple hundreds of queries and triangles).

For example, a query of 15k points with 100k triangles is 10 times faster with a bvh, and twice faster for 500 queries and 10k triangles.

Bvh is also optimised for the SignMethod::Raycast sign method.

[codecov]

Codecov Report

Attention: Patch coverage is 95.64103% with 17 lines in your changes missing coverage. Please review.

Project coverage is 97.22%. Comparing base (c2169c6) to head (4deaa91).
Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
mesh_to_sdf/src/bvh_ext.rs	88.28%	13 Missing ⚠️
mesh_to_sdf/src/lib.rs	98.56%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #75      +/-   ##
==========================================
- Coverage   97.25%   97.22%   -0.04%     
==========================================
  Files          10       11       +1     
  Lines        1421     1979     +558     
==========================================
+ Hits         1382     1924     +542     
- Misses         39       55      +16     

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[Azkellas]

BVH point queries are in the process of being upstreamed here: svenstaro/bvh#108

[Azkellas]

As the upstream PR has not been active for the last two monthes, with no update from the maintainer, I'm merging this one to get the benefits of the new BVH in this crate.
This version is slightly less optimized than the one I made upstream, but will do in the meantime.