feat: Prepare codegen to run with Fluent

[mkundu1]

1. Remove the hardcoded session dependency from codegen. Instead, a collection of static-infos is passed to the codegen functions. In Fluent side, we can control how much static API should be generated.
2. The pyfluent module level variable CODEGEN_OUTDIR controls where API files are written out during codegen. In Fluent, this path is set to some path within Fluent package.
3. The pyfluent module level variable CODEGEN_ZIP_SETTINGS controls whether to zip the settings API files. This is to reduce number of files during Fluent packaging.

Draft Fluent PR - 491855