Made execution.Cache an interface so we can mock it in unit tests

[jakobht]

What changed?
Made execution cache an interface

Why?
Now we can mock it in unit tests

How did you test it?
Unit and integration tests

Potential risks
Touches a lot of files but should be a safe change

Release notes

Documentation Changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.85%. Comparing base (fc6fae5) to head (36d7881).
Report is 4 commits behind head on master.

Additional details and impacted files

Files	Coverage Δ
service/history/decision/handler.go	94.93% <ø> (ø)
...ervice/history/engine/engineimpl/history_engine.go	83.67% <ø> (ø)
service/history/execution/cache.go	37.24% <100.00%> (ø)
service/history/ndc/activity_replicator.go	85.36% <ø> (ø)
service/history/ndc/history_replicator.go	17.13% <ø> (ø)
service/history/ndc/transaction_manager.go	72.81% <ø> (ø)
...ice/history/queue/cross_cluster_queue_processor.go	39.13% <ø> (ø)
...istory/queue/cross_cluster_queue_processor_base.go	45.99% <ø> (ø)
service/history/queue/factory.go	100.00% <ø> (ø)
service/history/queue/timer_queue_processor.go	24.57% <ø> (ø)
... and 12 more

... and 9 files with indirect coverage changes

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[coveralls]

Pull Request Test Coverage Report for Build 018faa8e-f44b-401a-8913-73e52eda9615

Details

• 3 of 3 (100.0%) changed or added relevant lines in 2 files are covered.
• 87 unchanged lines in 15 files lost coverage.
• Overall coverage decreased (-0.02%) to 69.441%

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Files with Coverage Reduction	New Missed Lines	%
service/history/shard/context.go	2	68.99%
service/matching/tasklist/db.go	2	73.23%
service/matching/tasklist/task_list_manager.go	2	76.48%
common/task/fifo_task_scheduler.go	2	85.57%
common/persistence/sql/sqlplugin/mysql/task.go	2	73.68%
service/history/task/transfer_active_task_executor.go	2	72.72%
common/persistence/sql/sqlplugin/mysql/db.go	2	79.49%
common/persistence/historyManager.go	2	66.67%
common/log/tag/tags.go	3	50.46%
service/history/task/transfer_standby_task_executor.go	4	86.63%

Totals
Change from base Build 018faa62-bb7e-4a04-89d5-ced9d0d49d30:	-0.02%
Covered Lines:	102369
Relevant Lines:	147418

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💛 - Coveralls