Add kparams to callproc

[brycecaine]

I couldn't find an issue that requests this, so forgive me if there is one and I missed it.

Django's version of callproc supports a kparams keyword argument:

https://docs.djangoproject.com/en/2.2/topics/db/sql/#django.db.models.CursorWrapper.callproc

It would be awesome if django-debug-toolbar supported kparams as well:

https://github.com/jazzband/django-debug-toolbar/blob/master/debug_toolbar/panels/sql/tracking.py#L188

I might attempt a pull request if I had more time, but I wanted to at least start the conversation.

Thank you so much for an amazing tool! I love the insight django-debug-toolbar provides.

[matthiask]

Definitely makes sense.

[matthiask]

I think this is a duplicate of #907