feat: Ref/Value behavior tracking

[iwoplaza]

Changes:

• Track referentiality of snippets (and their address space)
• Generate pointer types for shell-less arguments if the passed-in values are referential
• Forbid assignment of references
• Not allowing references to be returned from a function (unless it’s a reference to something define in that function)
• Make JS const statements be pointers if they take in a referential type (let statements)
• Treat JS const statements with naturally non-referential types to be WGSL const 🎉
• Track constant expressions

Reference assignment errors:

Invalid 'let' statement errors:

[github-actions]

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