Feature

wasmtime-cranelift only has 1 public function builder() which is really strange...

https://docs.rs/wasmtime-cranelift/latest/wasmtime_cranelift

at least make wasmtime-cranelift::Builder public

Benefit

developers can use customized Isa to work with wasmtime-cranelift

Implementation

based on https://github.com/bytecodealliance/wasmtime/blob/main/crates/cranelift/src/builder.rs#L17