Support the inputs namespace for process inputs check widget

[unkcpz]

fixes #434

• [x] Full implementation to support namespace
• [x] Import achive with process and smoke test the widgets (Instead we mock a node class with minimal requirements for testing purpose.)

[unkcpz]

The implementation is finished, the pre-commit failed by the same reason as https://github.com/aiidalab/aiidalab-widgets-base/pull/433 caused by warn.warning clauses. I'll separate the pre-commit fixes into a PR. (fixed in https://github.com/aiidalab/aiidalab-widgets-base/pull/442) For this one, I want to use it as an example to implement the unit test for widgets. I can mock a workchain process as did in aiida-quantumespresso. Pass the process to the widget and interactive with it through the traitlets and detect the change.