fix(native-preview): preserve lone surrogate string literals

[TorinAsakura]

Fixes #1701

Summary

• Encode JS string literal text with WTF-8 when it contains lone UTF-16 surrogate escapes
• Decode WTF-8 string data in native-preview APIs and msgpack strings
• Bump the binary AST protocol version from 5 to 6
• Add Go and native-preview regression coverage for surrogate pairs and lone high/low surrogates

Tests

• npm run -w @typescript/native-preview build
• npm run build
• npm run -w @typescript/native-preview test:only
• go test ./...

[TorinAsakura]

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