[RFC] [discussion] Deprecate FFI instance calls to non-static methods instead of static methods

I've added a new RFC to deprecate FFI instance calls to non-static method.

The PR https://github.com/php/php-src/commit/4acf0084dcd63ec369a610ec966db33f322694c8
https://github.com/php/php-src/commit/4acf0084dcd63ec369a610ec966db33f322694c8
deprecation of static methods is not a good solution. Now that the FFI API
is a mess, this PR will make a fix impossible

My RFC link
https://wiki.php.net/rfc/ffi-non-static-deprecated

I think this is the right direction.
Deprecating static FFI::new() is a huge BC break, performance loss and
limitation to static type inference.
Introducing FFI::CDef looks like a smaller BC break without other
degradations.

I would think about using the name "FFI::Scope" instead of "FFI::CDef"
(term scope already used in the API)

Thanks. Dmitry.

Regards
Chopin Xiao