Add default implementation of process_custom_jvp_call process_custom_vjp_call to jax.experimental.callback
#4620
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As of #4008, there are no more default implementations of
process_custom_jvp_callandprocess_custom_vjp_call. This results in an error whenever a function that has a custom jvp/vjp appears in aCallbackTrace.This PR adds the default implementation, though it should probably preserve the custom info, since
CallbackTracekeeps most primitive the same. We can iterate on the initial implementation below, if that is the best way forward.