Add a new user option in Python mode to improve the indentation

Add a new user option in Python mode to improve the indentation

* lisp/progmodes/python.el (python-indent-block-paren-deeper): New
user option.
(python-indent-context): Add a new context :inside-paren-from-block.
(python-indent--calculate-indentation): Modify according to
`python-indent-block-paren-deeper' and :inside-paren-from-block.
* test/lisp/progmodes/python-tests.el
(python-indent-inside-paren-block-1)
(python-indent-inside-paren-block-2)
(python-indent-inside-paren-block-3)
(python-indent-inside-paren-block-4): New tests.
(python-indent-inside-paren-5, python-indent-dedenters-8): Modify
according to the new context.
* etc/NEWS: Document the new user option.  (Bug#62696)