Remove some custom error types in Wasmtime (#5347)

* Remove some custom error types in Wasmtime

These types are mostly cumbersome to work with nowadays that `anyhow` is
used everywhere else. This commit removes `InstantiationError` and
`SetupError` in favor of using `anyhow::Error` throughout. This can
eventually culminate in creation of specific errors for embedders to
downcast to but for now this should be general enough.

* Fix Windows build

crates/jit/src/lib.rs

@@ -29,7 +29,7 @@ mod unwind;
 
 pub use crate::code_memory::CodeMemory;
 pub use crate::instantiate::{
-    subslice_range, CompiledModule, CompiledModuleInfo, ObjectBuilder, SetupError, SymbolizeContext,
+    subslice_range, CompiledModule, CompiledModuleInfo, ObjectBuilder, SymbolizeContext,
 };
 pub use demangling::*;
 pub use profiling::*;