Cli: notify on SIGINT

[mantas-sidlauskas]

What changed?
During start, handler will be notified on SIGINT

Why?
This will kick off all shutdown actions on Ctrl+C which is helpful during development and testing

How did you test it?

Potential risks

Release notes

Documentation Changes

[coveralls]

Pull Request Test Coverage Report for Build 698b2d44-7be2-4302-83db-c474bfc7afde

• 0 of 1 (0.0%) changed or added relevant line in 1 file are covered.
• 67 unchanged lines in 15 files lost coverage.
• Overall coverage decreased (-0.01%) to 56.889%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
cmd/server/cadence/cadence.go	0	1	0.0%

Files with Coverage Reduction	New Missed Lines	%
client/history/client.go	2	40.32%
client/history/metricClient.go	2	45.94%
common/persistence/executionManager.go	2	76.32%
common/persistence/statsComputer.go	2	95.71%
common/task/parallelTaskProcessor.go	2	92.75%
common/task/weightedRoundRobinTaskScheduler.go	2	89.64%
service/history/handler.go	2	48.42%
service/matching/taskListManager.go	2	74.66%
common/task/fifoTaskScheduler.go	3	84.54%
service/history/queue/timer_gate.go	3	95.83%

Totals
Change from base Build 90517954-e539-4a52-9ef3-2e35685d83cf:	-0.01%
Covered Lines:	81997
Relevant Lines:	144136

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💛 - Coveralls