Marat Al

Closes #1904

Basic NSURLSessionWebSocketTask functionality

11

Closes #1540

Seems like customers struggle to understand how to use different auth methods provided by Ably. So an app that demonstrate all of them would be useful. Also update current samples...

https://docs.ably.com/client-lib-development-guide/features/#RTP8a ┆Issue is synchronized with this [Jira Story](https://ably.atlassian.net/browse/ECO-4421) by [Unito](https://www.unito.io)

Create missing `ReferenceExtras` class

1

https://docs.ably.com/client-lib-development-guide/features/#REX1 ┆Issue is synchronized with this [Jira Story](https://ably.atlassian.net/browse/ECO-4420) by [Unito](https://www.unito.io)

Create missing `DeltaExtras` class

1

https://github.com/ably/canonical-api-reference-prototyping/blob/main/descriptions.md#class-deltaextras ┆Issue is synchronized with this [Jira Story](https://ably.atlassian.net/browse/ECO-4419) by [Unito](https://www.unito.io)

https://docs.ably.com/client-lib-development-guide/features/#TS14 Discuss if it duplicates `Stats` object (https://docs.ably.com/client-lib-development-guide/features/#TS12f and https://docs.ably.com/client-lib-development-guide/features/#TS12g) ┆Issue is synchronized with this [Jira Story](https://ably.atlassian.net/browse/ECO-4416) by [Unito](https://www.unito.io)

https://docs.ably.com/client-lib-development-guide/features/#TS12o ┆Issue is synchronized with this [Jira Story](https://ably.atlassian.net/browse/ECO-4413) by [Unito](https://www.unito.io)

https://docs.ably.com/client-lib-development-guide/features/#TS12n ┆Issue is synchronized with this [Jira Story](https://ably.atlassian.net/browse/ECO-4412) by [Unito](https://www.unito.io)

https://docs.ably.com/client-lib-development-guide/features/#TS12c ┆Issue is synchronized with this [Jira Story](https://ably.atlassian.net/browse/ECO-4408) by [Unito](https://www.unito.io)