Query specific collections for properties.

We're now enforcing the public API schema, so clients like MTP need
to query specific collections when asking for properties that are
specific to those media types.

Also refactor MediaScanner calls to go through MediaProvider, so
they can be handled by ModernMediaScanner.  We no longer directly
try inserting items, and instead rely completely on the scanner.

Bug: 127625964, 122263824
Test: atest MediaProviderTests
Test: atest cts/tests/tests/provider/src/android/provider/cts/MediaStore*
Change-Id: Ic86982766606a619afafe725f9c60013a5671840