[IMPLEMENT][A] Custom cast receiver support

[Jmilham21]

Description

Custom Chromecast receivers are now supported for DRM via Android 4.18.0. A new builder field is available for PlaylistItem and it should be made available in ReactNative

Acceptance Criteria

• Add to the props list to match the userInfo field now available for PlaylistItem
• Update the index.js and index.d.ts to match above
• Parse the userInfo prop in Java and add to the player builder
• Test that your custom data is being sent to your custom receiver (if you take this ticket, tag @jwplayer/team_sdks for assistance if you are unsure how)

Requirements

• 4.18.0 must be implemented as described here
• Documentation to match this (if you take this ticket, tag @jwplayer/team_sdks for assistance)