Line numbers in error messages

[analog-cbarber]

I have seen errors like Failed to get 'name: description' pair from '', which even given the name of the docstring, can be hard to track down.

It would be really nice if every error message always included a line number.

It would be even better if all line numbers were reported as actual source lines using a format that
IDEs will recognize so that you make. For instance, pylint will prefix each error with a <filepath>:<line#>: .
It makes fixing errors MUCH easier for the user.

[pawamoy]

Again, nice idea, thanks @analog-cbarber!

Griffe should already behave better regarding line numbers in warnings. But I guess we can leave this open as a simple improvement/bugfix for the time pytkdocs will continue to be used in projects, through the legacy handler.