Clean up BindingGenerator interface

[e-nomem]

The last PR about the BindingGenerator trait! (at least for now 😅 )

Now that all the bindings have been migrated, it seems fairly clear that the temp dir and python interpreter only matter for some bindings and shouldn't be a part of the trait interface itself. This PR hoists those parameters into the generator struct if necessary and adjusts the code to match.

It also creates a BindingType enum for PyO3 so that we can error out early if the python interpreter is required but missing, rather than panicking later on.

[Copilot]

Pull request overview

This PR refactors the BindingGenerator trait interface to remove temp_dir and interpreter parameters from the trait method signature. These dependencies are now managed within the generator structs themselves, improving encapsulation and simplifying the trait interface. The changes also introduce a BindingType enum for PyO3 to enable early validation of interpreter requirements.

Key Changes

• Removed temp_dir and interpreter parameters from the BindingGenerator::generate_bindings() trait method
• Added lifetime parameters to Pyo3BindingGenerator and CffiBindingGenerator to store interpreter references
• Introduced BindingType enum in PyO3 generator to distinguish between abi3 and non-abi3 builds with early error checking
• Updated all generator constructors to accept and validate their required dependencies upfront

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/binding_generator/mod.rs	Removed temp_dir and interpreter parameters from the BindingGenerator trait and generate_binding function signature
src/binding_generator/pyo3_binding.rs	Added lifetime parameter, introduced BindingType enum, moved tempdir into struct, added early interpreter validation in constructor
src/binding_generator/cffi_binding.rs	Added lifetime parameter, moved interpreter and tempdir into struct, updated constructor to require interpreter, removed redundant tempdir.close() call
src/binding_generator/uniffi_binding.rs	Removed unused temp_dir and interpreter parameters from generate_bindings method
src/binding_generator/bin_binding.rs	Removed unused temp_dir and interpreter parameters from generate_bindings method
src/build_context.rs	Updated all binding generator instantiations to use new constructors with proper error handling, simplified generate_binding calls