SPARKNLP-869 Adding threshold to properties for python module

[danilojsl]

Description

This change adds threshold for Classifier DL components in Python module

Motivation and Context

Fix a bug when Python users try to use threshold parameter

How Has This Been Tested?

Screenshots (if appropriate):

• Local Tests
• Google Colab notebook

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• Code improvements with no or little impact
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING page.
• I have added tests to cover my changes.
• All new and existing tests passed.