Revive PR: Add HealthChecks.Dapr

[cieciurm]

What this PR does / why we need it:

This PR revives #846

Which issue(s) this PR fixes:

#712

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

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

• Code compiles correctly
• Created/updated tests
• Unit tests passing
• End-to-end tests passing
• Extended the documentation
• Provided sample for the feature

[sungam3r]

Thanks @cieciurm !

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 76.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 66.49%. Comparing base (3956b01) to head (998da30).
Report is 123 commits behind head on master.

Files with missing lines	Patch %	Lines
src/HealthChecks.Dapr/DaprHealthCheck.cs	33.33%	5 Missing and 1 partial ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1947      +/-   ##
==========================================
+ Coverage   66.46%   66.49%   +0.02%     
==========================================
  Files         250      252       +2     
  Lines        8627     8652      +25     
  Branches      610      614       +4     
==========================================
+ Hits         5734     5753      +19     
- Misses       2741     2746       +5     
- Partials      152      153       +1     

Flag	Coverage Δ
Dapr	14.61% <76.00%> (?)

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