Enable DVB Metrics Reporting

[ryanmccartney]

📺 What

Allows DASH manifests which specifies a metric reporting block in the following form;

<Metrics metrics="HttpList(50,MediaSegment),RepSwitchList,PlayList,TcpList,DVBErrors"> 
    <Reporting schemeIdUri="urn:dvb:dash:reporting:2014" value="1" dvb:reportingUrl="h  ttps://example.com/metrics" dvb:probability="1000"/> 
</Metrics>

to report to the endpoint.

🛠 How

Changes the Dash.js import to use dashjs instead of index_mediaplayerOnly, additionally adds setXHRWithCredentialsForType("DVBReporting", true) to allow cookies to be passed with any of these reporting requests by the place - this is required in order to ID the session.

✅ Testing [Semi-optional]

Mock player expanded to include setXHRWithCredentialsForType method.

Test Guidelines

Test engineer sign off	❌

Bundle size could change as a result of this PR.