Support custom IO streams in execute_and_stream_output

[nikosavola]

Extend functionality in the async utility function to capture stdout and stderr to custom buffers.

[sourcery-ai]

Hey @nikosavola - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟡 General issues: 1 issue found
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Docstrings: all looks good

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