[core][jsi] Zero-copy NativeArrayBuffer for native-backed data

[barthap]

Why

Native-backed ArrayBuffers were copied when passed back to native functions expecting NativeArrayBuffer. React Native 0.86 now added an API to expose the original mutable backing buffer (see facebook/react-native#56156). This avoids unnecessary copies while preserving the existing copy behavior for JS-allocated buffers.

How

• Use tryGetMutableBuffer()/tryBorrowMutableBuffer() to borrow native-backed ArrayBuffer memory and retain the underlying MutableBuffer for the lifetime of the native wrapper.
• Keep the copy fallback for JS-allocated buffers, add typed-array view support with byteOffset
• Moved hermes.h import to .cpp file to avoid unnecessarily including it in Swift interop

Test Plan

Added tests to verify native-backed sharing and copy fallback behavior:

• iOS Unit tests
• Android instrumented tests

Checklist

• I added a changelog.md entry and rebuilt the package sources according to this short guide
• This diff will work correctly for npx expo prebuild & EAS Build (eg: updated a module plugin).
• Conforms with the Documentation Writing Style Guide

[expo-bot]

The Pull Request introduced fingerprint changes against the base commit: 4d40f2d

Fingerprint diff

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