HaikuDepot: Factor out Filters from Model

Non-functional change to factor the package filters
from the main model for the application.

Change-Id: I58f741c4491baba8afd5dd6e32bb0f7cdf64938f
Reviewed-

HaikuDepot: Factor out Filters from Model

Non-functional change to factor the package filters
from the main model for the application.

Change-Id: I58f741c4491baba8afd5dd6e32bb0f7cdf64938f
Reviewed-on: https://review.haiku-os.org/c/haiku/+/7896
Haiku-Format: Haiku-format Bot <no-reply+haikuformatbot@haiku-os.org>
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

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