Better support for argument pages.

1. Add arguments in Entry.UiLayout API for runtime parameters
2. Remove EntryItem for all pages in gallery, use entry.UiLayout instead.
3. Link argument page in gallery's home page
4. Disable "open page" / "open entry" when there is runtime parameter in DebugActivity
5. Add debug message to open all pages in SPA

Bug: 244122804
Test: manual - build Spa gallery
Change-Id: Ibd5dfe3f1d154b6464a50cc3d8ccb084d15d3bf4