MWPW-180759 - [M@S Studio] Promo campaign CRUD and list view (WIP)

[honstar]

Resolves https://jira.corp.adobe.com/browse/MWPW-180759
QA Checklist: https://wiki.corp.adobe.com/display/adobedotcom/M@S+Engineering+QA+Use+Cases

• added 2 new pages, promotions and promotions-form
• promotions page to list promotions from odin in /content/dam/mas/promotions is currently hidden in sidenav
• use https://mwpw-180759--mas--adobecom.aem.live/studio.html#page=promotions&path=acom
• implemented are only list-view and the creation flow
• filters and search are not implemented yet
• transition after creation of a promotion back to list view is also missing atm

Please do the steps below before submitting your PR for a code review or QA

• C1. Cover code with Unit Tests
• C2. Add a Nala test (double check with #fishbags if nala test is needed)
• C3. Verify all Checks are green (unit tests, nala tests)
• C4. PR description contains working Test Page link where the feature can be tested
• C5: you are ready to do a demo from Test Page in PR (bonus: write a working demo script that you'll use on Thursday, you can eventually put in your PR)
• C.6 read your Jira one more time to validate that you've addressed all AC's and nothing is missing

Test URLs:

• Before: https://main--mas--adobecom.aem.live/
• After: https://mwpw-180579--mas--adobecom.aem.live/

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Commits

• 50b6962 ✅ (latest)
• ffcd72e ✅