v2.1.0 WebRTC support

KVS and S3 creds support (#3)

* Support obtaining AWS credentials from the back end by using device cert and key.
* Add the File upload "fu" topic to the list of parsed topics from Identity.
* Support new video stream message type 112 and 113.

Added millisecond-precision to timestamp function (#2)

Initial Version 1.0.0 (#1)

* Initial commit from the SDK baseline. Todo DRA/Config rework.

* DRA and config rework

* Migrate common functions from SDK.

* Add unit tests.

* Add more unit tests and add coverage.

* Pytest, coverage docs etc.

* Minor fixes and doc updates.