Ensure DurableTask classes are hidden in Workflow Runtime package

[artur-ciocanu]

Description

The purpose of this PR is to ensure that we hide all the DurableTask Framework related classes behind runtime package and ensure that we use classes that are free of implementation details.

Issue reference

We strive to have all PR being opened based on an issue, where the problem or feature have been discussed prior to implementation.

Please reference the issue this PR will close: #1310

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles correctly
• Created/updated tests
• Extended the documentation

[artur-ciocanu]

@salaboy and @cicoyle could you please take a look and share your thoughts. Thank you.

[salaboy]

I've reviewed this PR and I am happy to approve, unless @cicoyle has any requested changes I think we should merge it.

[siri-varma]

LGTM

[cicoyle]

thanks for this refactor 🎉 looks great, just one comment for the header

[artur-ciocanu]

@cicoyle the header is fixed. Could you please approve, thank you!

[cicoyle]

Thank youuu

[codecov]

Codecov Report

Attention: Patch coverage is 82.05128% with 14 lines in your changes missing coverage. Please review.

Project coverage is 75.38%. Comparing base (d759c53) to head (1de8237).
Report is 126 commits behind head on master.

Files with missing lines	Patch %	Lines
...a/io/dapr/workflows/client/DaprWorkflowClient.java	52.63%	2 Missing and 7 partials ⚠️
...rkflows/runtime/DefaultWorkflowInstanceStatus.java	91.30%	1 Missing and 1 partial ⚠️
...kflows/runtime/WorkflowRuntimeStatusConverter.java	83.33%	1 Missing and 1 partial ⚠️
...rkflows/runtime/DefaultWorkflowFailureDetails.java	85.71%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1311      +/-   ##
============================================
- Coverage     76.91%   75.38%   -1.54%     
- Complexity     1592     1605      +13     
============================================
  Files           145      194      +49     
  Lines          4843     5090     +247     
  Branches        562      559       -3     
============================================
+ Hits           3725     3837     +112     
- Misses          821      933     +112     
- Partials        297      320      +23     

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