Fix/instanceof operator on primitives

[AntennaeVY]

Fixes typechecking of instanceof operator only working on classes. Now working on primitive types and enums

Before these gave an error

1 instanceof int
x instanceof MyEnum

Now the typechecker should properly check these are valid

[vercel[bot]]

@AntennaeVY is attempting to deploy a commit to the Boundary Team on Vercel.

A member of the Team first needs to authorize it.

[entelligence-ai-pr-reviews[bot]]

🔒 Entelligence AI Vulnerability Scanner

✅ No security vulnerabilities found!

Your code passed our comprehensive security analysis.

---

[imalsogreg]

Thanks for this! Typechecker side looks perfect! As discussed on Discord, we just need the interpreter side implemented, in order to merge this 🎉