bindings: python: provide Chip.get_all_lines()
bindings: python: provide Chip.get_all_lines()

Add a method for retrieving all GPIO lines exposed by a chip.

Signed-off-by: Bartosz Golaszewski <108de5fbc428215dc26df4468b48691526611148@gmail.com>

brgl/libgpiod,brgl/libgpiod,brgl/libgpiod,brgl/libgpiod