feat: add slack source

[gitcommitshow]

What are the changes introduced in this PR?

Adds Slack source transform

Research doc - https://www.notion.so/rudderstacks/Slack-Source-integration-119cd4bd3d9c466fb875c10dc77fc719?pvs=4

Please explain the objectives of your changes below

Put down any required details on the broader aspect of your changes. If there are any dependent changes, mandatorily mention them here

Any changes to existing capabilities/behaviour, mention the reason & what are the changes ?

No

Any new dependencies introduced with this change?

No

Any new generic utility introduced or modified. Please explain the changes.

No

Any technical or performance related pointers to consider with the change?

N

@coderabbitai review

---

Developer checklist

• [x] My code follows the style guidelines of this project

• [x] No breaking changes are being introduced.

• [x] All related docs linked with the PR?

• [x] All changes manually tested?

• [x] Any documentation changes needed with this change?

• [x] Is the PR limited to 10 file changes?

• [x] Is the PR limited to one linear task?

• [ ] Are relevant unit and component test-cases added?

Reviewer checklist

• [ ] Is the type of change in the PR title appropriate as per the changes?

• [ ] Verified that there are no credentials or confidential data exposed with the changes.

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[devops-github-rudderstack]

Test report for this run is available at: https://test-integrations-dev.s3.amazonaws.com/integrations-test-reports/rudder-transformer/3148/test-report.html

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 92.18750% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 87.88%. Comparing base (be0e5f5) to head (d16752b). Report is 1 commits behind head on develop.

Files	Patch %	Lines
src/v0/sources/slack/transform.js	89.58%	5 Missing :warning:

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3148   +/-   ##
========================================
  Coverage    87.87%   87.88%           
========================================
  Files          558      560    +2     
  Lines        30062    30126   +64     
  Branches      7194     7212   +18     
========================================
+ Hits         26418    26477   +59     
+ Misses        3341     3318   -23     
- Partials       303      331   +28     

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[sonarqubecloud[bot]]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[yashasvibajpai]

@shrouti1507 added you too for a review if time permits

[gitcommitshow]

Are we adding tests in this PR?

I wrote some tests on local but facing difficulties in verifying those on my local machine. Need suggestions on how to move forward.

[devops-github-rudderstack]

This PR is considered to be stale. It has been open for 20 days with no further activity thus it is going to be closed in 7 days. To avoid such a case please consider removing the stale label manually or add a comment to the PR.

[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
88.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[gitcommitshow]

Tested on prod. This is working fine.