Revert "Makes data validator API consistent with other type-checking"

This reverts commit d903745.

Bumps version to 1.22.6

To get minor fixes out.

bumps version from 1.22.4 to 1.22.5

Bumps version from 1.22.3 to 1.22.4

Bumps version from 1.22.2 to 1.22.3

Bumps hamilton from 1.22.1 to 1.22.2

Bumps version from 1.22.0.to 1.22.1

Bumps version from 1.21.2 to 1.22.0

Renames `node_name_` to `output_name_`

For the save_to decorator. Since I think output is more consistent
with our language. We really have not been consistent in the driver/code
base at all. Choosing `output` because the `.execute()` function requests
final_vars and is documented as the `outputs` one wants. Thus I think
reading `output_name_` will help people identify that this is what they
would use if they wanted to get the results out.

Bumps version to 1.21.2