Haiku 0.0.8

• Added experimental.force_name.
• Added ability to simulate a method name in experimental.name_scope.
• Added a config option for PRNG key block size.
• Added unroll parameter to dynamic_unroll.
• Remove use of deprecated jax.tree_* functions.
• Many improvements to our examples.
• Improve error messages in vmap.
• Support jax_experimental_name_stack in jaxpr_info.
• transform_and_run now supports a map on PRNG keys.
• remat now uses the new JAX remat implementation.
• Scale parameter is now optional in RMSNorm.