[core] Add PageContainer component

[Janpot]

Closes #3746

Adds a page container component tat extends the MUI core container with title, breadcrumbs and actions. Added it as well to the layout if the default generated page in the CLI.

@apedroferreira Proposing a change to slug here. As it represents the url segments i.e. the things that go between slashes it could make sense to not include the slash in them. I'm also removing the Container from the DashboardLayout. We can leave this to the user, or in this case the PageContent component. 🤔 Maybe we need to rename it to segment as "slug" may mean something else in the context of urls?

resolved in #3794

docs preview
tutorial preview

To do

• docs theming issues
• actions area doesn't overflow on small screen
• add in overview features section
• add in CLI to be generated in specific pages layout.tsx
• update tutorial to contain this component

[bharatkashyap]

Looks great! Added some readability comments that can be addressed in a follow up. Approving.