feat: added ability to specify id for pc

[IlgamGabdullin]

Discussed issue here

Added new optional id?: string param in handleNewPeerConnection method and emited the id back in callback calculateNetworkScores, so now developers can use it that way

webRTCIssueDetector.handleNewPeerConnection(pc, 'some-id-1')
webRTCIssueDetector.handleNewPeerConnection(pc, 'some-id-2')
webRTCIssueDetector.handleNewPeerConnection(pc, 'some-id-3')

and in callback it wil be

onNetworkScoresUpdated: (scores) => scores.id; // some-id-X

@evgmel @desher @panov-va please take a look