This commit updates Wasmtime's version to 0.19.0, Cranelift's version to 0.66.0, and updates the release notes as well.
This is the wasmtime-jit crate, which contains JIT-based execution
for wasm, using the wasm ABI defined by wasmtime-environ and the
runtime support provided by wasmtime-runtime.
Most users will want to use the main wasmtime crate instead of using this
crate directly.