Add support for shutdown API and add client docs

[halspang]

Description

This commit adds support for the shutdown API. It also adds docs for that method and a few others which were missing from the docs.

https://github.com/dapr/dotnet-sdk/issues/914

Signed-off-by: Hal Spang [email protected]

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: #914

Checklist

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

• [x] Code compiles correctly
• [x] Created/updated tests
• [x] Extended the documentation

[codecov[bot]]

Codecov Report

Merging #922 (81a44b9) into master (e6ded69) will decrease coverage by 0.04%. The diff coverage is 90.47%.

@@            Coverage Diff             @@
##           master     #922      +/-   ##
==========================================
- Coverage   69.68%   69.63%   -0.05%     
==========================================
  Files         155      155              
  Lines        5119     5121       +2     
  Branches      553      553              
==========================================
- Hits         3567     3566       -1     
- Misses       1421     1424       +3     
  Partials      131      131              

Flag	Coverage Δ
net5	?
net6	?
netcoreapp3.1	69.63% <90.47%> (-0.01%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/Dapr.Client/DaprClient.cs	93.61% <ø> (ø)
src/Dapr.Client/DaprClientGrpc.cs	86.61% <90.47%> (-0.12%)	:arrow_down:
src/Dapr.Actors/DaprHttpInteractor.cs	53.59% <0.00%> (-1.11%)	:arrow_down:

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