[WIP] Add a static benchmark for xcmetrics

[testableapple]

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Before	After
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☑️ Contributor Checklist

• [ ] I have signed the Stream CLA (required)
• [ ] This change follows zero ⚠️ policy (required)
• [x] This change should be manually QAed
• [ ] Changelog is updated with client-facing changes
• [ ] New code is covered by unit tests
• [ ] Comparison screenshots added for visual changes
• [ ] Affected documentation updated (docusaurus, tutorial, CMS)

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[Stream-SDK-Bot]

StreamChat XCMetrics

target	metric	benchmark	branch	performance	status
MessageList	Hitches total duration	8.3 ms	5.01 ms	39.64% 🔼	🟢
	Duration	2.6 s	2.55 s	1.92% 🔼	🟢
	Hitch time ratio	3.3 ms per s	1.97 ms per s	40.3% 🔼	🟢
	Frame rate	79 fps	78.53 fps	0.59% 🔼	🟢
	Number of hitches	0.8	0.6	25.0% 🔼	🟢
ChannelList	Hitches total duration	10.8 ms	9.18 ms	15.0% 🔼	🟢
	Duration	2.6 s	2.54 s	2.31% 🔼	🟢
	Hitch time ratio	4.2 ms per s	3.63 ms per s	13.57% 🔼	🟢
	Frame rate	76 fps	75.02 fps	0.68% 🔼	🟢
	Number of hitches	0.8	0.8	0.0% 🔽	🟢