Support common documentation formats

[lars-reimann]

• Refactor NumpyDocParser to use docstring-parser
• Support Google docstrings #19
• Support reStructuredText docstrings #18
• Support epytext docstrings #17
• Flag to choose between different documentation formats #16
• Auto-Detect documentation format #15
• For __init__ parameters in NumPyDoc: Look up documentation either on __init__ or containing class #10

Additional Context

• Examples of the different formats: https://realpython.com/documenting-python-code/#google-docstrings-example
• pyment can detect the used documentation format: https://github.com/dadadel/pyment/blob/2c10b1c64093adbce8db369a3db4321e6c3c7c32/pyment/docstring.py#L647
• pdoc might also be helpful for this, particularly the conversion from a docstring format to Markdown: https://pdoc.dev/docs/pdoc/docstrings.html
• docstring_parser seems to be exactly what we are looking for

[lars-reimann]

Closing this in favor of the linked issues.