Cleanup root objects

[ricardoV94]

Description

This is full of obscure stuff:

```python
import pytensor
dir(pytensor)

['Any',
 'FunctionMaker',
 'In',
 'Lop',
 'Mode',
 'NoReturn',
 'OpFromGraph',
 'Optional',
 'OrderedUpdates',
 'Out',
 'Path',
 'ProfileStats',
 'Rop',
 'Variable',
 '__annotations__',
 '__api_version__',
 '__builtins__',
 '__cached__',
 '__doc__',
 '__docformat__',
 '__file__',
 '__loader__',
 '__name__',
 '__package__',
 '__path__',
 '__spec__',
 '__version__',
 '_as_symbolic',
 '_version',
 'as_symbolic',
 'checkpoints',
 'clone_replace',
 'compile',
 'config',
 'configdefaults',
 'configparser',
 'disable_log_handler',
 'dprint',
 'foldl',
 'foldr',
 'function',
 'function_dump',
 'get_underlying_scalar_constant',
 'grad',
 'gradient',
 'graph',
 'graph_replace',
 'ifelse',
 'link',
 'logging',
 'logging_default_formatter',
 'logging_default_handler',
 'map',
 'misc',
 'npy_2_compat',
 'pp',
 'pprint',
 'predefined_linkers',
 'predefined_modes',
 'predefined_optimizers',
 'printing',
 'pytensor',
 'pytensor_logger',
 'raise_op',
 'reduce',
 'rpath',
 'scalar',
 'scan',
 'shared',
 'singledispatch',
 'sparse',
 'subgraph_grad',
 'sys',
 'tensor',
 'updates',
 'utils',
 'warnings']