[feature] Shell completion

Is it possible that isort provide a tab completion for common shells like:

❯ isort -<TAB>
option
-a                                          ADD_IMPORTS, --add-import ADD_IMPORTS
--ac                                        Ensures the output doesn't save if the resulting file contains syntax errors.
--af                                        Forces import adds even if the original file is empty.
--allow-root                                Tells isort not to treat / specially, allowing it to be run against the root dir.
--append                                    Only adds the imports specified in --add-import if the file contains existing imports.
--append-only                               Only adds the imports specified in --add-import if the file contains existing imports.
--atomic                                    Ensures the output doesn't save if the resulting file contains syntax errors.
...

Maybe shtab can be a possible solution?

• https://github.com/google/vimdoc/blob/823e3bbc1944d0377408b602ec10ba0c39a8bf8e/setup.py#L36
• https://github.com/andreafrancia/trash-cli/blob/b913bf30b277cecc04f27858d275802684ecac13/setup.cfg#L31-L33
• https://github.com/inducer/pudb/blob/1dea19a3a14ba2398e5b7909eb86cad0c0152b3d/setup.py#L24
• https://github.com/piccolomo/plotext/blob/f760510cc6957de82c57502c07e4d0c0e4762302/setup.py#L25
• https://github.com/wookayin/gpustat/blob/56a9dcf3c99f29065f1215afcff372d01da9f256/setup.py#L116

TIA!

Start by reviewing isort's CLI entry point and the linked shtab examples to understand how completion scripts could be generated for common shells. Confirm which shells and packaging or installation path are in scope, then verify that pressing Tab after isort - exposes the available options.