In essence, this lifts the implementation of QR decomposition out of the lowering rules and into the JAX level instead.
This is useful because it allows direct access to the raw form of the decomposition returned by geqrf; sometimes we actually want access to the Householder reflectors instead of their product. Currently neither geqrf nor orgqr are differentiable in isolation.
Change in preparation for adding an implementation of jnp.linalg.slogdet that uses QR decomposition instead of LU decomposition.
Fixes https://github.com/google/jax/issues/2322
PiperOrigin-RevId: 449033350
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