Splitio-client

- Fixed an issue when pushing unique keys tracker data to redis if no keys exist, i.e. get_treatment flavors are not called.

- Added redisUsername configuration parameter for Redis connection to set the username for accessing redis when not using the default `root` username

- Added support for Flag Sets on the SDK, which enables grouping feature flags and interacting with the group rather than individually (more details in our documentation):
- Added new variations of the get treatment methods to support evaluating flags in given flag set/s.
- get_treatments_by_flag_set and get_treatments_by_flag_sets
- get_treatments_with_config_by_flag_set and get_treatments_with_config_by_flag_sets
- Added a new optional Split Filter configuration option. This allows the SDK and Split services to only synchronize the flags in the specified flag sets, avoiding unused or unwanted flags from being synced on the SDK instance, bringing all the benefits from a reduced payload.
- Note: Only applicable when the SDK is in charge of the rollout data synchronization. When not applicable, the SDK will log a warning on init.
- Updated the following SDK manager methods to expose flag sets on flag views.
- Removed raising an exception when Telemetry post config data fails, SDK will only log the error.

- Exclude tests from when building the package
- Fixed exception when fetching telemetry stats if no SSE Feature flags update events are stored

- Improved streaming architecture implementation to apply feature flag updates from the notification received which is now enhanced, improving efficiency and reliability of the whole update system.

- Updated terminology on the SDKs codebase to be more aligned with current standard without causing a breaking change. The core change is the term split for feature flag on things like logs and code documentation comments.
- Added detailed debug logging for redis adapter.
- Fixed setting defaultTreatment to 'control' if it is missing in localhost JSON file.