Use a custom Pdb class in the Python shellHEADmaster

The custom Pdb class enables native completion in pdb by
wrapping the pdb's native completer.  It also makes necessary
function definitions like __PYTHON_EL_* available between pdb
frames, and enables non-native completion/ffap/eldoc
functionalities when debugging inside python modules.

* lisp/progmodes/python.el (python-shell-send-setup-code): Fix
the separator between python-shell-setup-codes.
(python-shell-completion-native-setup): Move common completion
setup code ...
(python-shell-completion-setup-code): ... here.
(python-shell-completion-at-point): Enable native completion for
pdb and respect the delimiter of pdb completer.
(python-shell-pdb-setup-code): New variable.
(python-shell-comint-watch-for-first-prompt-output-filter): Send
setup codes only once.
(python-ffap-module-path, python-eldoc--get-doc-at-point): Stop
sending setup code in every function call.
* test/lisp/progmodes/python-tests.el (python-tests--pdb-1)
(python-shell-pdb-1): New test.
* etc/NEWS: Mention the change.  (bug#80182)

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