performance enhancements

[knaaptime]

this PR speeds up the calculation of a few indices by using rvlib, numba, and parallelization. Depends on conda-forge/rvlib-feedstock#14

[codecov-commenter]

Codecov Report

❌ Patch coverage is 75.00000% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.41%. Comparing base (19940f8) to head (28d47f9).

Files with missing lines	Patch %	Lines
segregation/singlegroup/spatial_prox_profile.py	36.84%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #183      +/-   ##
==========================================
- Coverage   63.49%   63.41%   -0.08%     
==========================================
  Files         118      118              
  Lines        4421     4445      +24     
==========================================
+ Hits         2807     2819      +12     
- Misses       1614     1626      +12     

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