fix(scripting/v8): handle Proxy objects in msgpack serialization

[gtolontop]

Goal of this PR

Fix the TypeError: r.toArray is not a function crash that occurs when passing Proxy objects to msgpack serialization (e.g. via emitNet).

How is this PR achieving the goal

Adds a materialize() fallback in the pack() function that deep-clones Proxy objects into plain objects/arrays before encoding. The fallback only triggers on TypeError, so there is zero performance impact on the normal path.

1. pack() first tries the normal msgpack.encode
2. If it throws a TypeError (the specific error Proxies cause), it retries with materialize(data) which recursively converts Proxies to plain objects
3. materialize handles circular references via WeakMap and preserves ArrayBuffer/TypedArray

This PR applies to the following area(s)

FiveM, RedM (shared V8 scripting runtime)

Successfully tested on

• emitNet with a Proxy object as parameter — serializes without crash
• emitNet with plain objects — works as before, no fallback triggered
• Nested Proxy objects — serialize correctly
• console.warn is emitted when fallback activates

Checklist

• Code compiles and has been tested successfully.
• Code explains itself well and/or is documented.
• My commit message explains what the changes do and what they are for.
• No extra compilation warnings are added by these changes.

Fixes issues

Fixes #3824