feat(img2vid,txt2vid): Initial support for img2vid,txt2vid (#1442)

* feat(img2vid): Initial support for img2vid

* doc(SD): fix SDXL Example

* Minor fixups for img2vid

* docs(img2img): fix example curl call

* feat(txt2vid): initial support

Signed-off-by: Ettore Di Giacinto <mudler@users.noreply.github.com>

* diffusers: be retro-compatible with CUDA settings

* docs(img2vid, txt2vid): examples

* Add notice on docs

---------

Signed-off-by: Ettore Di Giacinto <mudler@users.noreply.github.com>