video streamer performance

[irvingoujAtDevolution]

• test(video-streamer): add webm_stream correctness suite
• test(video-streamer): add streaming repro tests and bench
• style(video-streamer): align tests and logs with IronRDP
• refactor(video-streamer): gate perf diagnostics behind feature
• perf(video-streamer): silence bench output by default
• style(video-streamer): drop unrelated channel writer formatting
• refactor(video-streamer): gate trace/debug behind perf-diagnostics

[github-actions]

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