Resolve "Add `import` data operation to import a module or object into the DAG"

What does this MR do?

This MR adds the import, call and import_and_call data operations that make it possible to import a module or callable on the fly, alleviating the need to invoke register_operation for every little operation ...

Can this MR be accepted?

• Implemented the changes
• Tests added or adjusted
• Checked test coverage
• Pipeline passes
• Changelog entry added
• Version bumped to 0.10.2a0

Anything to double-check?

Nope.

Related issues

Closes #109 (closed)