Rename following subspace classes based on feedback from ADS refactor proposal.

Changes made:
- Rename `behavior` terminology to `mode`.
- Rename `static` to `snap`.
- Rename `ArDevice` terminology to `View`.

Bug: 541471606

Test: Tested on Moohan emulator.
Change-Id: Ifc4d28b8357a3f39e68a139fe18ccf038c5f4b04