Implement basic codec_options

[pcorpet]

No description provided.

[codecov]

Codecov Report

Merging #670 into develop will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #670      +/-   ##
===========================================
+ Coverage    95.36%   95.43%   +0.06%     
===========================================
  Files           18       19       +1     
  Lines         3520     3548      +28     
===========================================
+ Hits          3357     3386      +29     
+ Misses         163      162       -1     

Impacted Files	Coverage Δ
mongomock/codec_options.py	100.00% <100.00%> (ø)
mongomock/collection.py	92.42% <100.00%> (-0.02%)	⬇️
mongomock/database.py	99.17% <100.00%> (-0.07%)	⬇️
mongomock/mongo_client.py	97.00% <100.00%> (-0.15%)	⬇️
mongomock/filtering.py	98.96% <0.00%> (+0.34%)	⬆️

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