Process GitHub message with assoc content

[roxblnfk]

What was changed

Process content like {"message":"...","documentation_ur":"..."}

Checklist

• Closes [Bug] Dload crush #77

[codecov]

Codecov Report

❌ Patch coverage is 42.85714% with 4 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...rnal/GitHub/Exception/GitHubRateLimitException.php	0.00%	2 Missing ⚠️
...le/Repository/Internal/GitHub/GitHubRepository.php	0.00%	2 Missing ⚠️

Files with missing lines	Coverage Δ	Complexity Δ
...c/Module/Repository/Internal/GitHub/Api/Client.php	100.00% <100.00%> (ø)	12.00 <0.00> (ø)
...rnal/GitHub/Exception/GitHubRateLimitException.php	0.00% <0.00%> (ø)	2.00 <0.00> (ø)
...le/Repository/Internal/GitHub/GitHubRepository.php	0.00% <0.00%> (ø)	11.00 <0.00> (+1.00)

... and 40 files with indirect coverage changes

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