Massage the code of distribution_properties_test a bit.

- Split the `distributions` strategy into one for `base_distributions`
  and one for `distributions` that includes compounds.
  - In so doing, increase coverage of compound distributions.
  - Also limit the nesting depth of compound distributions.
- Define a namedtuple for the information needed to instantiate
  a Distribution.
- Smaller tweaks.

PiperOrigin-RevId: 257438879

tensorflow_probability/python/bijectors/bijector_properties_test.py

@@ -105,9 +105,9 @@ def _constraint(param):
   return draw(
       tfp_hps.broadcasting_params(
           batch_shape,
+          params_event_ndims,
           event_dim=event_dim,
           enable_vars=enable_vars,
-          params_event_ndims=params_event_ndims,
           constraint_fn_for=_constraint,
           mutex_params=MUTEX_PARAMS))