Make the input_name of PipelineML a property

[Galileo-Galilei]

Description

The input_name attribute of PipelineML class must be checked with a _check_input_name function before it is set to enforce inconsistency. For now, each time it is set inside the code, _check_input_name is called first. If a user modifies it, the new name must be checked first. The behavior of PipelineML is not tested when input_name is invalid, which hinders 10% test coverage.

Possible Implementation

In the PipelineML class, decorate input_name with @Property.

    @property
    def input_name(self) -> str:
        return self._input_name

    @input_name.setter
    def input_name(self, name: str) -> None:
        self._check_input_name(name)
        self._input_name = name

and add tests accordingly.