Extract the watching logic into a separate module

[nolar]

Issue : #13

It is done as a preparation for the tests of watch-streaming & event multiplexing tests (#63) — just to make both change-sets easier to review.

This extraction is same-for-same, no changes in the logic. Only the code cohesion is adjusted: the watch-calls are now next to the streaming/iterating routines, away from queueing part.

[zincr]

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[zincr]

🤖 zincr found 1 problem , 0 warnings

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✅ Large Commits
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• ✅ Approved by PR author @nolar
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