Change ViewModel visibility from public to internal for all feature modules

[audgns10]

What I have done and why

• Changed the visibility modifier of all ViewModel classes within their respective feature modules from public to internal, ensuring that ViewModels are only accessible within their own modules.

• This modification improves encapsulation and enforces clear module boundaries, preventing unintended usage of ViewModels across modules.

• By restricting access with the internal modifier, the codebase becomes more maintainable and less prone to unintended dependencies.

• Updated each feature module separately to reflect this visibility change, keeping each commit modular and easier to review.

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Updated Modules

The following feature modules have been updated:

• BookmarksViewModel (in feature-bookmarks)
• ForYouViewModel (in feature-foryou)
• SearchViewModel (in feature-search)

[audgns10]

@dturner

Would appreciate it if you could take a look at this PR when you get the chance
Made some visibility changes to ViewModels for better encapsulation between modules.
Happy to make any changes if needed!

[hoc081098]

LGTM