WIP: Reduce copies, eliminate a lot of UTF-16 transcoding#1120

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Tyler-IN wants to merge 9 commits intomodelcontextprotocol:mainfrom

Tyler-IN:perf/utf8-contentblock-streaming

Commits on Jan 6, 2026

Update protocol types to use ReadOnlyMemory<byte> for binary data

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Fix test files to work with new binary data representation

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Add cache invalidation when Blob/Data properties are set

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Apply performance optimizations using MemoryMarshal.TryGetArray

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Use GetBytes overload with offset and count parameters

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Use Base64.DecodeFromUtf8 to avoid string intermediate during decoding

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perf(core): UTF-8-first content blocks + lower-allocation stream/HTTP transports
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move text utility methods into McpTextUtilities
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add appropriate attributes to Utf8TextContentBlock
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