Making DaprDefaults public

[WhitWaldo]

Description

Per request, making the DaprDefault constants and methods public so they're accessible to projects using any of the Dapr .NET SDKs without also requiring duplicate knowledge of the connection configuration information.

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: #1832

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

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.24%. Comparing base (d0e2f13) to head (0623c9b).

Files with missing lines	Patch %	Lines
src/Dapr.Common/DaprDefaults.cs	50.00%	5 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1845   +/-   ##
=======================================
  Coverage   63.24%   63.24%           
=======================================
  Files         330      330           
  Lines        9526     9526           
  Branches     1110     1110           
=======================================
  Hits         6025     6025           
  Misses       3190     3190           
  Partials      311      311           

Flag	Coverage Δ
net10.0	63.20% <50.00%> (ø)

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