Draft: Feature/Vivado code autocompletion

It adds Python stub file *.pyi for Vivado class.

Use cases:

• Autocompletion of Vivado methods when typing vivado.<tab> with documentation (docstring)
• Static type checking of Python code for example using pyright
• Automatic API documentation generation of available Vivado methods for example using Sphinx

Examples:

• List of available methods:

• Method docstring: