feat(data/equiv/module): add module.to_module_End (#10300)
The new definitions are:
* `distrib_mul_action.to_module_End`
* `distrib_mul_action.to_module_aut`
* `module.to_module_End`
Everything else is a move.
This also moves the group structure on linear_equiv earlier in the import heirarchy.
This is more consistent with where it is for `linear_map`.
