added aggregation filter end to mongodb extensions

[ilovemesomeramen]

#1537
Specifies the index in the pipeline at which no documents are being filtered out anymore. Allows for way faster query execution times if heavy transformations happen later in the pipeline such as lookups

[uriyyo]

LGTM

[codecov]

Codecov Report

Attention: Patch coverage is 7.14286% with 13 lines in your changes missing coverage. Please review.

Project coverage is 92.49%. Comparing base (41a7a9f) to head (61aa781).
Report is 15 commits behind head on main.

Files with missing lines	Patch %	Lines
fastapi_pagination/ext/beanie.py	0.00%	5 Missing ⚠️
fastapi_pagination/ext/bunnet.py	0.00%	5 Missing ⚠️
fastapi_pagination/ext/motor.py	25.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1538      +/-   ##
==========================================
- Coverage   93.07%   92.49%   -0.59%     
==========================================
  Files          41       41              
  Lines        1733     1745      +12     
==========================================
+ Hits         1613     1614       +1     
- Misses        120      131      +11     

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