feat: implement allow_email_share field 📬

[tomas-salgado]

Description ✏️

Implement a checkbox on the emails page that allows members to opt-in or opt-out of having their email shared with Chapter Leaders.

Closes #51

• adds allow_email_share field to students table in db
• default gives allow_email_share a value of True
• implements db migrations
• implement frontend checkbox on emails page, where initial value (checked or not) is in line with allow_email_share value in database for that user
• implement backend functionality such that database is updated when checkbox is clicked

After:

Before:

Type of Change 🐞

• Feature - A non-breaking change which adds functionality.
• Fix - A non-breaking change which fixes an issue.
• Refactor - A change that neither fixes a bug nor adds a feature.
• Documentation - A change only to in-code or markdown documentation.
• Tests - A change that adds missing unit/integration tests.
• Chore - A change that is likely none of the above.

Checklist ✅

• I have done a self-review of my code.
• I have manually tested my code (if applicable).
• I have added/updated any relevant documentation (if applicable).

[ramiAbdou]

This is excellent work, @tomas-salgado! I can't believe you ramped up so quickly with this. 😅 Just have a few small suggestions, and we should be good to go!

[ramiAbdou]

I just tested this locally and it works beautifully! 🙌

I pushed a small fix which adds the id to the checkbox which makes the label of the checkbox clickable - if you can just merge those changes in, we should be good to ship!

[ramiAbdou]

LGTM! 🚀