feat: add mongodb source connector

[Luishfs]

Which issue does this PR close?

Closes #3042

Rationale

What changed?

Added MongoDB as a source connector

Local Execution

• Passed
  Video

simplescreenrecorder2-2026-05-20_08.15.01.mp4

showing results ( with the master branch updated, since last video was a month ago )

• Pre-commit hooks passed
  last commit with prek

AI Usage

1. Claude
2. Claude for general rust questions & MongoDB insertion bash i used in the video
3. Didn't use generated code
4. Yes ( just might need a bit of time since i pushed it just now =P )

[github-actions]

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[hubcio]

@amuldotexe maybe you wanna take a stab at reviewing this? :) from quick glance I can see that docs are not updated and no actual integration tests are added.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.55%. Comparing base (b29bcd5) to head (a8240d3).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3285      +/-   ##
============================================
- Coverage     73.57%   73.55%   -0.02%     
  Complexity      943      943              
============================================
  Files          1241     1241              
  Lines        115087   115087              
  Branches      91572    91603      +31     
============================================
- Hits          84671    84651      -20     
+ Misses        27574    27565       -9     
- Partials       2842     2871      +29     

Components	Coverage Δ
Rust Core	74.53% <ø> (ø)
Java SDK	58.44% <ø> (ø)
C# SDK	70.12% <ø> (-0.53%)	⬇️
Python SDK	81.06% <ø> (ø)
Node SDK	91.53% <ø> (+0.12%)	⬆️
Go SDK	40.20% <ø> (ø)
see 14 files with indirect coverage changes

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[hubcio]

for now @Luishfs please fix CI (commit Cargo.lock) and add integration tests.
/author

[Luishfs]

@hubcio Hey, sorry for the wait, had a couple of things going on but just addressed your comments.
I'm going to be more active from now on since i have a couple of ideas i want to implement as sources/sinks, but will wait until i've done everything on the mongodb source

[hubcio]

@Luishfs no worries, take your time. you can also chime-in on discord, there's connectors channel so we can discuss those ideas. feel free to ping me. 🦀