Complete the SIMD integration

With the current status of things I believe it's feasible to ship and maintain a backward compatible, fallback implementation of SIMD(e.g. not based on the vector API).

This will enable to do it in a [multi release jar](https://www.baeldung.com/java-multi-release-jar) and hook everything by default in interpreter and compiler at least.

We want users to be able to "just use" SIMDs.