Move jax.extend.ffi module to top level jax.ffi
#25633
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dfm
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froystig
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In #21531, @froystig and I decided to land the JAX foreign function interface (FFI) under that
jax.extendsubmodule, since it can be considered a mechanism for extending JAX. Since then, this decision has been questioned (most recently from @mattjj and @jakevdp), because thejax.extendsubmodule really has a narrower scope: interfacing with JAX internals (see the extend JEP for more details). Instead, the FFI is designed to allow users to extend JAX without interacting with JAX internals. Furthermore, code underjax.extendisn't required to follow the API compatibility contract that JAX's public APIs, but our aim is for the FFI to be a stable and well-supported public API.With this in mind, this PR moves the FFI submodule back into the top level
jax.ffinamespace, while leaving a deprecated import shim underjax.extend.ffi.