feat(connectors): 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]

Thanks for the pull request. It is now waiting for review, labeled S-waiting-on-review.

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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

❌ Patch coverage is 86.66667% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.79%. Comparing base (bf77e99) to head (e65a7ba).

Files with missing lines	Patch %	Lines
core/connectors/sources/mongodb_source/src/lib.rs	86.66%	4 Missing and 10 partials ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             master    #3285       +/-   ##
=============================================
- Coverage     74.57%   46.79%   -27.79%     
  Complexity      937      937               
=============================================
  Files          1249     1247        -2     
  Lines        123564   108060    -15504     
  Branches      99839    84363    -15476     
=============================================
- Hits          92150    50564    -41586     
- Misses        28430    54805    +26375     
+ Partials       2984     2691      -293     

Components	Coverage Δ
Rust Core	39.95% <86.66%> (-35.78%)	⬇️
Java SDK	58.57% <ø> (ø)
C# SDK	69.44% <ø> (-0.48%)	⬇️
Python SDK	81.06% <ø> (ø)
PHP SDK	83.57% <ø> (ø)
Node SDK	91.26% <ø> (+0.03%)	⬆️
Go SDK	40.25% <ø> (ø)

Files with missing lines	Coverage Δ
core/connectors/sources/mongodb_source/src/lib.rs	86.66% <86.66%> (ø)

... and 365 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. 🦀

[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed in 7 days if no further activity occurs.

If you need a review, please ensure CI is green and the PR is rebased on the latest master. Don't hesitate to ping the maintainers - either @core on Discord or by mentioning them directly here on the PR.

Thank you for your contribution!

[slbotbm]

@Luishfs Is this PR ready for review?

[Luishfs]

@hubcio i believe i've covered the last workflow issues, along with running all the checks listed under contributing, can we proceed on review?

[Luishfs]

/ready

[hubcio]

[hubcio]

explain the reasoning behind all changes in this file. why did you remove these deps in mongodb connector PR?