Add classNames to the hostEl for Swiper element

[Ashkanph]

Hello

I think it would be good to have the classNames for the hostEl (swiper-container) in Swiper element (WebComponent). In v9 we had the classNames for the swiper-container.

In my case, I need the swiper-initialized class to know when the Swiper is initialized. I know there are other approaches, such as using the swiperafterinit event, but having the classNames makes it easier.

If I am correct, the following changes will do it. I can create a PR if it is ok:

Ashkanph@bf38ac3

[Ashkanph]

@nolimits4web, Could you please check the change to see if it is ok to create the PR? Thank you.

Ashkanph@bf38ac3

[nolimits4web]

Hi, i would avoid spamming host element with the classes as in 99% of the cases they are not needed here and can lead to some unexpected behavior. I would stick with using afterinit/init events instead