feat: Add initiatives gem to 0.27 branch

[paulinebessoles]

🎩 Description

This PR adds the intiative gem and its migrations.

📌 Related Issues

No related issue

Testing

Check that the initiatives are enabled on the admin dashboard.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -6.98% ⚠️

Comparison is base (eb4b189) 77.17% compared to head (5d04952) 70.19%.

Additional details and impacted files

@@              Coverage Diff              @@
##           bump_0.27     #418      +/-   ##
=============================================
- Coverage      77.17%   70.19%   -6.98%     
=============================================
  Files             58       48      -10     
  Lines           1555     1275     -280     
=============================================
- Hits            1200      895     -305     
- Misses           355      380      +25     

see 20 files with indirect coverage changes

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[armandfardeau]

Hello thanks for your contribution !

However:

• the P.R. description is empty, please help us generate release note by adding it.
• The CI fails, please wait until the original branch is fixed then rebase.
• Your P.R. title is missing a descriptive feat:, fix: to generate release note

I've switched this P.R. to draft, feel free to request a review when everything is in order