Next Gen of Owl

[Skn0tt]

This PR contains a bunch of forward-facing changes to Owl:

• splits up acknowledgement from worker (enabling for long-running jobs)
• implements a periodical stale-check
• adds "tenants", used for sharding data across a Redis Cluster
• internal code quality improvements

[coveralls]

Pull Request Test Coverage Report for Build 728419739

• 270 of 286 (94.41%) changed or added relevant lines in 12 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+2.8%) to 91.412%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/encodeRedisKey.ts	5	6	83.33%
src/redis-commands.ts	13	14	92.86%
src/shared/migrator/migrator.ts	13	14	92.86%
src/worker/job-distributor.ts	53	54	98.15%
src/index.ts	13	16	81.25%
src/shared/acknowledger.ts	40	44	90.91%
src/shared/stale-checker.ts	43	48	89.58%

Totals
Change from base Build 700793021:	2.8%
Covered Lines:	421
Relevant Lines:	443

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💛 - Coveralls

[Skn0tt]

This PR got much too big,
I should merge it real quick!
Better make it work then fast
This PR is a blast