Improve Actor sample

[RicardoNiepel]

Description

• using die ActorClient also as Dapr application
• adding sample.http to Actor sample

Issue reference

No - only small changes

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

Merging #758 (d085ace) into master (1acd372) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #758   +/-   ##
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  Coverage   68.90%   68.90%           
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  Files         137      137           
  Lines        4458     4458           
  Branches      500      500           
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  Hits         3072     3072           
  Misses       1271     1271           
  Partials      115      115           

Flag	Coverage Δ
net5	67.94% <ø> (-0.86%)	⬇️
netcoreapp3.1	68.86% <ø> (ø)

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[halspang]

What's the reason for doing this? You don't need to run this app with a dapr sidecar to invoke the actors. I think showing that you can interact with actors from outside of dapr is an important point.

[RicardoNiepel]

Then both options should be added to the docs to explain the two ways.

In real scenarios, even if you are communicating with actors from the outside - this "outside" application will not run in the actors cluster - thus expecting dapr sidecar of the actors app is running on the same machine will not be possible.