Generate cross cluster tasks in mutable state task generator

[yycptt]

What changed?

• Generate cross cluster tasks in mutable state task generator
• Allocate cross cluster taskID and timestamp in shardContext

Why?

• For supporting cross-domain operations

How did you test it?

• Unit test

Potential risks
N/A, currently cross-domain/cluster operation is not allowed in decision checker.

Release notes

Documentation Changes

[coveralls]

Pull Request Test Coverage Report for Build a25c3f80-2472-4755-8bad-a4990f87a5d3

• 29 of 43 (67.44%) changed or added relevant lines in 6 files are covered.
• 98 unchanged lines in 9 files lost coverage.
• Overall coverage decreased (-0.04%) to 60.206%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
service/history/historyEngine.go	0	1	0.0%
service/history/shard/context.go	8	12	66.67%
service/history/execution/mutable_state_builder.go	11	20	55.0%

Files with Coverage Reduction	New Missed Lines	%
common/persistence/cassandra/cassandraPersistenceUtil.go	2	86.9%
common/task/fifoTaskScheduler.go	2	87.63%
service/matching/matcher.go	2	91.46%
common/persistence/executionStore.go	4	75.5%
common/persistence/statsComputer.go	4	95.71%
service/history/shard/context.go	16	65.13%
common/persistence/sql/sqlExecutionManager.go	17	62.04%
common/persistence/cassandra/cassandraPersistence.go	20	52.45%
service/history/execution/context.go	31	66.78%

Totals
Change from base Build d1612efc-d52b-4488-a809-6b2617c7dbeb:	-0.04%
Covered Lines:	88931
Relevant Lines:	147712

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💛 - Coveralls