Draft: Make the field parameter optional.

David Schäferrequested to merge
optional_field into develop

With field=None the given function will be executed on all variables in saqc.data. Unfortunately the type hints don't reflect this change, because of limitations in python decorator typing (see comment of saqc.core.register.register.outer`).

Solves #385 (closed)

Edited by David Schäfer

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