SDK / exoplayer

Add support for including Common Media Client Data (CMCD) in the outgoing requests of adaptive streaming formats DASH, HLS, and SmoothStreaming.

API structure and API methods:
   *   CMCD logging is disabled by default, use `MediaSource.Factory.setCmcdConfigurationFactory(CmcdConfiguration.Factory cmcdConfigurationFactory)` to enable it.
   *   All keys are enabled by default, override `CmcdConfiguration.RequestConfig.isKeyAllowed(String key)` to filter out which keys are logged.
   *  Override `CmcdConfiguration.RequestConfig.getCustomData()` to enable custom key logging.

NOTE: Only the following fields have been implemented: `br`, `bl`, `cid`, `rtp`, and `sid`.

Issue: google/ExoPlayer#8699

#minor-release

PiperOrigin-RevId: 539021056
(cherry picked from commit b7e71538a3fc6892cf75f1e0799f339e63d2f1ec)