Added Dapr Metadata package with tests

[WhitWaldo]

Description

Added Metadata retrieval support with testing to project.

This package has been Implemented to use the options pattern. To use, register with DI via builder.Services.AddDaprMetadata() and inject via IOptions<DaprMetadata>, IOptionsSnapshot<DaprMetadata>, and IOptionsMonitor<DaprMetadata> into the DI-registered types you wish to access the properties from.

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: #[issue number]

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 83.33333% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.23%. Comparing base (d433287) to head (4dc9086).

Files with missing lines	Patch %	Lines
src/Dapr.Common/DaprDefaults.cs	0.00%	7 Missing ⚠️
...c/Dapr.Testcontainers/Harnesses/MetadataHarness.cs	0.00%	7 Missing ⚠️
src/Dapr.Metadata.Runtime/DaprMetadataProvider.cs	95.23%	0 Missing and 1 partial ⚠️
...c/Dapr.Testcontainers/Common/DaprHarnessBuilder.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1846      +/-   ##
==========================================
- Coverage   63.54%   63.23%   -0.31%     
==========================================
  Files         313      330      +17     
  Lines        9431     9526      +95     
  Branches     1106     1110       +4     
==========================================
+ Hits         5993     6024      +31     
- Misses       3175     3190      +15     
- Partials      263      312      +49     

Flag	Coverage Δ
net10.0	63.19% <83.33%> (-0.34%)	⬇️

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