feat: Add Play middleware to avoid calling play on tech

[ldayananda]

Limitations: can't be used on mobile platforms and is only available for use on later versions of videojs.

• Implements a terminating play middleware.
• Removes special adplaying handling
• Reworks the "fast track" cases where there is no preroll ad to first advance to Preroll state and contentResuming mode
• Simplify logic to determine whether a manual play is required after resuming to content
• Further modularizes cancelContentPlay and removes 1ms timeout

Todos:

• [x] write integration tests for play middleware
• [x] finalize mocking for unit tests for play middleware
• [x] more negative test cases in unit tests

[incompl]

LGTM, just some minor comments

[bcsdasneogi]

QA : LGTM