Cat-angular: add part content to cat-dialog-content

[ianovalena]

Upd
.cat-dialog-pull solves this problem, but you need some investigation to find it. Should we create documentation for dialog component?

Is your feature request related to a problem? Please describe.
I would like to remove padding from the div with the cat-dialog-content class to be able to apply custom styles, but it's not possible as this div is inside the shadow dom

Describe the solution you'd like
Add part="content" to div with class cat-dialog-content inside cat-dialog component

Additional details
.cat-dialog-content available with [noScroll]="true", but scroll is turned on by default and still usefull in different places, so it would be nice to have additional way for styling