New Feature: Add a dedicated `Workspaces` page in settings

[trjExpensify]

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Deliverables

1. Add Workspaces as a menu item on the Avatar > Settings page, incl. a preview of 2 workspace avatars right-aligned on the row
2. Add a new page and move the list of workspaces to that page
3. Add a New workspace green footer button to the bottom of that new page
4. Remove New workspace from the three dots overflow menu that's accessed from a workspace (leave Delete workspace there)

Platform:

• To be implemented consistently across all platforms

Notes/Photos/Videos:

Figma file

Expensify/Expensify Issue URL: N/A
Issue reported by: @trjExpensify
(Internal) Slack conversation: https://expensify.slack.com/archives/C038T8LKKV5/p1657879133021399

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CC: @shawnborton @JmillsExpensify as you may be interested in following along.

[melvin-bot]

Triggered auto assignment to @thienlnam (Engineering), see https://stackoverflow.com/c/expensify/questions/4319 for more details.

[trjExpensify]

I'll keep myself assigned for the CM portion. Passing this on to engineering first to triage.

[shawnborton]

Love it!

[thienlnam]

This will have to be on hold for API refactors (specifically for Policy_Create and Policy_Delete) cc @chiragsalian who is working on those -> currently held on Pattern B

After that, the rest of the items can be completed by an external contributor / or internal to make it quicker to correspond to design and UI items

Putting internal / on hold for now for these internal issues

https://github.com/Expensify/Expensify/issues/215184
https://github.com/Expensify/Expensify/issues/215181