Add filtering capabilities to Activity app

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Feature request

Which Nextcloud Version are you currently using: (see administration page)

Is your feature request related to a problem? Please describe.
Currently, as an instance grows and has more users, activity notifications can be flooded with information that is not relevant for a user.

Describe the solution you'd like
With a filtering feature, users would be able to configure what activities they really need to be notified about. For example, specific files that the user has "interacted" with, Files that a Team a user is part of have affected, etc.

Describe alternatives you've considered
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Additional context
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