VTS: Create libhwc_aidl_test out of HWC VTS

[Why]
VTS tests targeting HWC depend on wrapper and helpers that are very
well done and beneficial to other tests outside of VTS that are also
targeting HWC.
Instead of rewriting all these helpers in a new effort to test HWC using
Cuttlefish, a common library for HWC AIDL tests would be beneficial.

[How]
Take out all the helpers out of the VTS directory and create a new
libhwc_aidl_test directory that other tests can reference.
Also, remove any mention of VTS out of them because they're not longer
directly related to VTS.

Bug: b/384710755  , b/383783834
Test: atest VtsHalGraphicsComposer3_TargetTest
Flag: TEST_ONLY

Change-Id: Icaff0c50186d7b016e1d1822e084bf12001fe5be