Camera: Add camera capture request VTS tests

Use single camera capture requests to verify basic
'processCaptureRequest' functionality:
- 'processCaptureRequestSinglePreview' will generate
a valid preview capture request. The result needs to
include both valid stream Id and frame number.
- 'processCaptureRequestInvalidSinglePreview' will
omit the settings from the first capture request. Hal
should handle this by returning an appropriate error.
- 'processCaptureRequestInvalidSingleSnapshot' will
have a valid blob request but no valid output buffers.
Hal should again return appropriate error in this case.

BUG: 32022758
Test: compile and run the gtest binary on device
Change-Id: I021dd150b12d4be39fae47e13ba82d3db105bfa3