Proposal: make GraalPy async-only?

[pwtail]

Hi! I have a rather fresh idea: what about making GraalPy async-only?

This includes not supporting blocking I/O and a very limited support of C extensions. Let it extend in Java/Kotlin.

I think, async python is possibly a good space for JVM.

Speaking of implementation (given the JVM has virtual threads) you can make async/await a no-op (instead of using generators like CPython), So async/await keywords to be there just to mark the async code.

What do you think?