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

Cargo.lock

@@ -3643,7 +3643,6 @@ dependencies = [
  "rustc-demangle",
  "serde",
  "target-lexicon",
- "thiserror",
  "wasmtime-environ",
  "wasmtime-jit-debug",
  "wasmtime-jit-icache-coherence",
@@ -3687,7 +3686,6 @@ dependencies = [
  "paste",
  "rand 0.8.5",
  "rustix",
- "thiserror",
  "wasmtime-asm-macros",
  "wasmtime-environ",
  "wasmtime-fiber",