[audio] Add volume hardening metrics and logs

Prepare for hardening enforcement for volume APIs by logging express
metrics on volume api usage and the potential affect of levels of
hardening.

Add logging to hardening enforcer for consistency with playback
hardening.

Integrate enforcement shell cmd to test enforcement even with flags
disabled. Note, this CL does not yet include any flags, so by default no
restriction is enabled.

Test: atest AudioManagerTest
Bug: 376481063
Flag: EXEMPT logging only
Change-Id: If7bad31b121bf52d7dd2e2e33930f44f2365e8f6