Transcripts - Add feature flag

[ashiagr]

Description

This adds a feature flag for the Transcripts project.

Testing Instructions

1. Install debug/ debugProd build
2. Go to Profile -> Settings -> Beta features
3. ✅ Notice Transcripts in the feature flags list
4. ✅ Notice that feature flag is disabled for release build and has no remote flag configured yet

** Feature tier is set to free temporarily

Checklist

• [ ] If this is a user-facing change, I have added an entry in CHANGELOG.md
• [x] Ensure the linter passes (./gradlew spotlessApply to automatically apply formatting/linting)
• [ ] I have considered whether it makes sense to add tests for my changes
• [ ] All strings that need to be localized are in modules/services/localization/src/main/res/values/strings.xml
• [ ] Any jetpack compose components I added or changed are covered by compose previews
• [ ] I have updated (or requested that someone edit) the spreadsheet to reflect any new or changed analytics.

I have tested any UI changes...

• [ ] with different themes
• [ ] with a landscape orientation
• [ ] with the device set to have a large display and font size
• [ ] for accessibility with TalkBack