camera.metadata@3.2: Auto-generate metadata enums

Replace hand-written types.hal with one autogenerated from the
metadata definitions, like the SDK, NDK, and camera_metadata C library
definitions are.

No changes to actual definitions; only formatting changes and basic
documentation of each entry are added.

Add the new hash of camera.metadata@3.2::types to current.txt.

Bug: 33262893
Test: Manual inspection of new vs. old types.hal, builds, hidl-doc output
   is acceptable
Change-Id: Idd8c228359e45de3609bc16ac19e878b0ed0a557