Add DaprInternalError.as_json_safe_dict for actors

[Druid-of-Luhn]

Description

The FastAPI and Flask extensions for actors serialise the value of any raised DaprInternalError to JSON, which fails if the error contains bytes in its _raw_response_bytes field.

This change adds a new as_json_safe_dict method and uses it in place of the as_dict method in the FastAPI and Flask extensions.

Two unit tests for the as_json_safe_dict method are included.

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: #761

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 (n/a)

[elena-kolevska]

@holopin-bot @Druid-of-Luhn Thanks for your contribution!

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[codecov]

Codecov Report

Attention: Patch coverage is 55.55556% with 8 lines in your changes missing coverage. Please review.

Project coverage is 86.13%. Comparing base (bffb749) to head (7000b63).
Report is 19 commits behind head on main.

Files with missing lines	Patch %	Lines
ext/dapr-ext-fastapi/dapr/ext/fastapi/actor.py	42.85%	4 Missing ⚠️
ext/flask_dapr/flask_dapr/actor.py	20.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #765      +/-   ##
==========================================
- Coverage   86.63%   86.13%   -0.50%     
==========================================
  Files          84       89       +5     
  Lines        4473     4978     +505     
==========================================
+ Hits         3875     4288     +413     
- Misses        598      690      +92     

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[Druid-of-Luhn]

Thanks @elena-kolevska for your suggested approach in the original issue! It was also quite a nice codebase to contribute to.

[marcduiker]

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