Minor update to Python API page

[adkinsty]

• Add new "Attributes" section to the Python API reference page
• Add items for self._configuration.samples_limit and self.sampler under the new "Attributes" section
• Add new method reference to Python API reference page for adding variables to a scan
• Remove code-copy widget from Python API reference code snippets
• Move get_scan_results method reference to the section for handling scan results in Python API reference page
• Update samples limit page to include additional method for setting datasource-level samples limits with the Soda Library

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