BSON made optional in emmet-core

[munrojm]

bson package made optional to allow for jsanitize util to be used with API client.

[codecov-commenter]

Codecov Report

Merging #530 (58cf778) into main (d62de3a) will decrease coverage by 0.02%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main     #530      +/-   ##
==========================================
- Coverage   97.52%   97.49%   -0.03%     
==========================================
  Files         116       91      -25     
  Lines       24142    22023    -2119     
==========================================
- Hits        23544    21472    -2072     
+ Misses        598      551      -47     

Impacted Files	Coverage Δ
emmet-core/emmet/core/utils.py	57.00% <50.00%> (-33.38%)	⬇️
emmet-core/emmet/core/oxidation_states.py	73.33% <0.00%> (-17.78%)	⬇️
emmet-core/emmet/core/qchem/molecule.py	80.18% <0.00%> (-16.99%)	⬇️
emmet-core/emmet/core/summary.py	80.00% <0.00%> (-10.38%)	⬇️
emmet-core/emmet/core/settings.py	88.52% <0.00%> (-9.84%)	⬇️
emmet-core/emmet/core/vasp/calc_types/utils.py	82.45% <0.00%> (-7.02%)	⬇️
emmet-core/emmet/core/molecules/atomic.py	93.15% <0.00%> (-2.74%)	⬇️
emmet-core/emmet/core/mpid.py	94.44% <0.00%> (-1.86%)	⬇️
emmet-core/emmet/core/molecules/bonds.py	80.72% <0.00%> (-1.81%)	⬇️
... and 28 more

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