Feature/millicast dvr switching

[wjoosen]

This PR prepares for the soon to be released DVR switching changes, which have very limited effect on the public APIs. For Web and Android they introduce a new optional field millicastSrc in a TheoLiveEndpoint.

The necessary bridging for Android and types were added.

For iOS millicastSrc is not included in the EndpointAPI.

‼️version 10.4.0 of the native player SDK is required for these changes to work

[tvanlaerhoven]

Note: native Android v10.4.0 is needed for this

[Yousif-CS]

I don't believe the millicast subscriber token should be added here. @GillesMoris-Dolby @turbidwater @RameshDPrasad since auth token is consumed via the theolive API instead, we shouldn't add that field here. Correct me if I am wrong.

[turbidwater]

@wjoosen @Yousif-CS For what it's worth, in Web we're adding it this way, where it prefers the information from the theoLive.authToken field, but also could accept it from the discovery response:
subscriberToken: this._authToken ?? endpoint.millicastSrc.subscriberToken