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
326f15a392