Growing jextract

[Maurizio Cimadamore]

Hi,
with JDK 22 near us, we have spent some quality time with jextract, to 
make sure the code it generates is as good as it can be ahead of the 
finalizaton of the FFM API. This resulted in several changes, both in 
the implementation (so, invisible to jextract users) and in the 
generated code, as we cleaned up the translation strategy to better 
adhere with the core principles behind the jextract tool. These changes 
are captured in details in this document:

https://cr.openjdk.org/~mcimadamore/panama/jextract_changes.html

It might be a good time to take the latest jextract for a spin (using 
your favourite C library!) and report back, in case we missed anything. 
You can find the latest sources in this branch:

https://github.com/openjdk/jextract/tree/panama

Binary snapshots of this newer version are also available here (note 
that MacOS/Arm64 builds is also supported now):

https://jdk.java.net/jextract/

Cheers
Maurizio