Add async workflow request consumer for Start/SignalWithStart support

[taylanisikdemir]

What changed?
Implemented Async workflow request consumer component which will consume requests from queue and call corresponding frontend API (sync version of the request). It currently support following async request types:

• StartWorkflowExecutionAsyncRequest
• SignalWithStartWorkflowExecutionAsyncRequest

How did you test it?
Added unit tests. Integration and bench tests are coming soon.

[coveralls]

Pull Request Test Coverage Report for Build 018da5de-9ee4-4295-b66c-71e4a6090b3c

Details

• -22 of 217 (89.86%) changed or added relevant lines in 7 files are covered.
• 28 unchanged lines in 10 files lost coverage.
• Overall coverage increased (+0.06%) to 62.784%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
service/worker/service.go	0	1	0.0%
common/log/tag/tags.go	0	3	0.0%
common/metrics/tags.go	0	3	0.0%
common/asyncworkflow/queue/kafka/queue.go	17	21	80.95%
common/asyncworkflow/queue/consumer/default_consumer.go	159	170	93.53%

Files with Coverage Reduction	New Missed Lines	%
common/task/weighted_round_robin_task_scheduler.go	1	89.05%
common/persistence/sql/sqlplugin/postgres/db.go	2	85.0%
common/persistence/sql/sqlplugin/postgres/task.go	2	73.4%
common/task/fifo_task_scheduler.go	2	87.63%
service/history/task/transfer_active_task_executor.go	2	72.31%
service/history/task/transfer_standby_task_executor.go	2	87.01%
common/asyncworkflow/queue/kafka/queue.go	3	84.31%
service/matching/taskListManager.go	3	80.71%
service/frontend/wrappers/metered/metered.go	4	65.5%
service/history/execution/mutable_state_task_refresher.go	7	71.2%

Totals
Change from base Build 018da536-b82b-454e-a15a-48f6f51419d7:	0.06%
Covered Lines:	92609
Relevant Lines:	147503

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💛 - Coveralls