Allow to send custom parameters to build backends

[Hofer-Julian]

Problem description

For many backends, it will be useful to configure them in some way.
While we hope that many use cases will be satisfied with profiles, we expect that there's still a need to more directly set customization. This includes sending arguments to the build backend

[wolfv]

There is a draft implementation for this feature for the CMake build backend in

prefix-dev/pixi-build-backends#74

And

#3115