PLAYRTS-5508 Beta only audio content pages

[pyby]

Description

This PR proposes an internal test only for audios tab with two options:

• use the PAC Audio landing page.
• use landing page per channel home page, if the channel remote configuration as a contentPageId defined.

It's also propose a internal test for show squared images, if supported by BU.

Changes Made

• Add contentPageId in channel remote configuration object.
• Add two settings:
  • AudioHomepageOption to select Audios tab content.
  • SquareImages to force radio show image to square.
  • Update UI if those settings changed.
• PageViewModel .audio(channel: RadioChannel?) channel Id can have a nullable channel, to support only Play Audio landing page.
• Introduce ContentType enum to describe videoOrTV, audioOrRadio or mixed content.
• Use SRGImageVariant on show regarding the ContentType.
• Update SRGDataProdvier to support podcast show image variant. Add podcast image variant srgdataprovider-apple#65

Some "FIXME" added as for now, a section does not know itself if it's videoOrTV or audioOrRadio content in.

Checklist

• I have followed the project's style guidelines.
• I have performed a self-review of my own changes.
• I have made corresponding changes to the documentation.
• My changes do not generate new warnings.
• I have tested my changes and I am confident that it works as expected and doesn't introduce any known regressions.
• I have reviewed the contribution guidelines.