feat: Add mongodb backend

[tibordp]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 92.28070% with 22 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.87%. Comparing base (07b6c01) to head (1b14667).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/pyncette/mongodb.py	92.11%	10 Missing and 12 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #48      +/-   ##
==========================================
- Coverage   97.25%   96.87%   -0.38%     
==========================================
  Files          26       27       +1     
  Lines        3495     3780     +285     
  Branches      224      274      +50     
==========================================
+ Hits         3399     3662     +263     
- Misses         57       67      +10     
- Partials       39       51      +12     

Flag	Coverage Δ
integration	96.85% <92.28%> (-0.38%)	⬇️
py3.10	72.83% <22.45%> (-4.11%)	⬇️
py3.11	72.83% <22.45%> (-4.11%)	⬇️
py3.12	72.83% <22.45%> (-4.11%)	⬇️
py3.13	72.83% <22.45%> (-4.11%)	⬇️
py3.14	72.72% <22.45%> (-4.12%)	⬇️
py3.9	72.81% <22.45%> (-4.11%)	⬇️

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