Adding needed functionality to nonhom_grip.py

[sonachitchyan]

:pencil: Description

Adding nonhom_grid.py that includes velocity and $ \frac{dv}{dr}$ functions for shells and finding tau_sobolev_factor

Some of the changes shown here are part of https://github.com/tardis-sn/tardis/pull/2024

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:ballot_box_with_check: Checklist

• [ ] I requested two reviewers for this pull request
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[codecov[bot]]

Codecov Report

Merging #2035 (7e2a326) into master (b0b04ee) will decrease coverage by 3.74%. The diff coverage is 10.86%.

:exclamation: Current head 7e2a326 differs from pull request most recent head 8ed512f. Consider uploading reports for the commit 8ed512f to get more accurate results

@@            Coverage Diff             @@
##           master    #2035      +/-   ##
==========================================
- Coverage   61.33%   57.59%   -3.75%     
==========================================
  Files          75       77       +2     
  Lines        8602     8737     +135     
==========================================
- Hits         5276     5032     -244     
- Misses       3326     3705     +379     

Impacted Files	Coverage Δ
.../montecarlo/montecarlo_numba/nonhomologous_grid.py	9.24% <9.24%> (ø)
...montecarlo/montecarlo_numba/calculate_distances.py	29.50% <16.66%> (ø)
tardis/montecarlo/montecarlo_numba/numba_config.py	100.00% <100.00%> (ø)
tardis/visualization/widgets/custom_abundance.py	16.56% <0.00%> (-42.97%)	:arrow_down:
tardis/io/config_validator.py	89.47% <0.00%> (-1.01%)	:arrow_down:
tardis/montecarlo/montecarlo_numba/base.py	29.75% <0.00%> (-0.76%)	:arrow_down:
tardis/montecarlo/montecarlo_configuration.py	100.00% <0.00%> (ø)
tardis/transport/geometry/calculate_distances.py
tardis/transport/frame_transformations.py
tardis/transport/r_packet_transport.py
... and 10 more

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[andrewfullard]

This has been done now right?