Add bedrock streaming mock server support

[hmstepanek]

Overview

Add streaming support for Bedrock mock server.

[github-actions[bot]]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ PYTHON	black	3	0	0	1.53s
✅ PYTHON	flake8	3		0	1.02s
✅ PYTHON	isort	3	0	0	0.2s
✅ PYTHON	pylint	3		0	4.88s

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[hmstepanek]

Closing this as it was combined into another streaming branch and already merged.