Optimized Content Capture workflow by caching some state at the application level.

Content Capture for an activity and/or package is only available when the Content Capture service
explicitly whitelists it. As the whitelist is kept at system-server level, it's better to fetch that
info when the application is started and cache it locally, so we can optimize the
ContentCaptureManager APIs to return quickly when it's disabled.

This CL also caches other values such as the buffer parameters.

Test: atest CtsContentCaptureServiceTestCases

Bug: 120494182
Bug: 121202151

Change-Id: I9d5211bca496ffa85ba9efc2a7bb32411834b787