Adding dapr api token interceptor for durable task

[salaboy]

Description

This PR adds the interceptor to inject the Dapr API Token to the Durable Tasks Worker, which is needed to make sure that the token gets sent by the workflows SDK.

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: #962

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

[artursouza]

Is there a way to avoid making this public? This makes this part of the SDK user facing surface with this change.

[salaboy]

Because this is an interceptor, I believe it is ok to make it public and part of the interface, as this functionality can apply to other application code where the Dapr Token might want to be added.. does that make sense @artursouza ?

[artursouza]

I propose we create a new class, called WorkflowGrpcInterceptor (or something similar) in a packaged called io.dapr.workflows.internal because that communicate that anything in that package is for internal use and is not part of our interface with the application.

So, we can use the same class in both places here but just will not be a shared instance.

[salaboy]

done

[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (da395f8) 76.54% compared to head (05a94f0) 76.64%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
.../workflows/internal/ApiTokenClientInterceptor.java	12.50%	7 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #963      +/-   ##
============================================
+ Coverage     76.54%   76.64%   +0.10%     
- Complexity     1467     1470       +3     
============================================
  Files           137      138       +1     
  Lines          4472     4475       +3     
  Branches        527      527              
============================================
+ Hits           3423     3430       +7     
+ Misses          763      760       -3     
+ Partials        286      285       -1     

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