[iOS] Program Progress Page

[nizmaylova]

As a user, I would like to view the program progress page.
As a user, I would like to know the number of courses completed, in progress and remaining in the Program.

Note: Current edX app from store is shown in the attachment

[moiz994]

In our effort to bring the openedX app to parity with the prod app, we need to implement a webview based Programs screen.

ℹ️ The current prod app has a switcher in the Learn tab but for the RG app we will be implementing this in the bottom nav Programs tab for the time being.

We will take a feature flag based approach to introduce a webview based Programs screen so the community has a choice to either use native or webview implementation.

Acceptance Criteria

• Back navigation needs to be implemented on the webview screen.
• App behaviour to reflect flag settings as expected