Remove unused code from cadence.internal package

[natemort]

What changed? Remove unused code from internal packages to improve code coverage and reduce maintenance burden. Users shouldn't be accessing internals.

Why? Improving code coverage and reducing maintenance burden

How did you test it? Unit tests

Potential risks User code may be accessing internals within the client and could break. Generally this should be a compile time breakage and we do not support accessing internals.

Release notes

Documentation Changes

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Please upload report for BASE (master@6d3f55f). Learn more about missing BASE report.

Additional details and impacted files

Files with missing lines	Coverage Δ
...adence/internal/common/WorkflowExecutionUtils.java	46.55% <ø> (ø)
.../internal/replay/ActivityDecisionStateMachine.java	77.41% <ø> (ø)
...rnal/replay/ChildWorkflowDecisionStateMachine.java	45.61% <ø> (ø)
...ce/internal/replay/SignalDecisionStateMachine.java	57.14% <ø> (ø)
...nce/internal/replay/TimerDecisionStateMachine.java	80.00% <ø> (ø)
...ternal/sync/SimulatedTimeoutExceptionInternal.java	100.00% <ø> (ø)
...uber/cadence/internal/sync/SyncWorkflowWorker.java	81.81% <ø> (ø)
...m/uber/cadence/internal/sync/WorkflowInternal.java	87.62% <ø> (ø)
...cadence/internal/sync/WorkflowRetryerInternal.java	83.05% <ø> (ø)
...va/com/uber/cadence/internal/worker/Throttler.java	0.00% <ø> (ø)

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[coveralls]

Pull Request Test Coverage Report for Build 2542

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 8 unchanged lines in 4 files lost coverage.
• Overall coverage increased (+0.4%) to 65.75%

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Files with Coverage Reduction	New Missed Lines	%
src/main/java/com/uber/cadence/internal/sync/WorkflowRetryerInternal.java	1	86.44%
src/main/java/com/uber/cadence/internal/sync/WorkflowThreadContext.java	1	81.58%
src/main/java/com/uber/cadence/internal/worker/Poller.java	1	78.13%
src/main/java/com/uber/cadence/internal/replay/ReplayDecider.java	5	80.27%
<!--	Total:	8

Totals
Change from base Build 2537:	0.4%
Covered Lines:	12741
Relevant Lines:	19378

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💛 - Coveralls