[DocsUI Peek] Responsive layout - bottom metadata sheet

Add metadata bottom sheet for mobile-like layouts.

Resize the preview area depending on the position of the
bottom sheet (hidden/collapsed/halfexpanded/expanded). Demo:
http://screencast/cast/NjIyMzYwNTIyMTI5NDA4MHxkNzg2Nzc4Yy1mOQ

Bug: 416377408
Flag: com.android.documentsui.flags.use_material3
Flag: com.android.documentsui.flags.use_peek_preview_ro
Test: (functional) PeekUiTest#testResponsiveMetadataLayout
Test: (unit) MetadataBottomSheetControllerTest
Change-Id: I72486b5e3e28650b71a8472736733ab1a6dca432