Add configuration knobs and enable the WebAssembly compact-import-section proposal

This proposal has recently moved to stage 4 support in the CG meaning that modules may start using this by default. We should enable this within Wasmtime and turn it on as well. This won't really require any substantive changes to Wasmtime since the proposal is primarily implemented in `wasmparser` which already implements this. The main change, though, is that we probably want to enable fuzzing for this proposal as it's not currently implemented.