Add support for Tesseracts with complex-valued inputs

[jacanchaplais]

Summary

• Add detection of primitive Python complex types in the InputSchema to parse.py:_simplify_schema()
• Modify render_fields() macro in templates/template.j2 to catch the complex input type, and render a pair of numerical inputs, taking real and imaginary components of the complex number
• Ensure that this is correctly formatted in the Tesseract inputs of the generated app

Why is this needed?

Adds missing compatibility for the Python primitive complex type.

Usage example

tesseract-streamlit "http://localhost:39597" app.py

Where http://localhost:39597 has a complex attribute in its InputSchema, and app.py has a grouped pair of numerical inputs for real and imaginary components of the corresponding complex number.