Page - User should have the ability to change the main tag used for Page component

[depatil-redhat]

Is this a new component or an extension of an existing one?
This is the existing Page component

Describe the feature
Add a prop component to change the default main tag for Page component

Any other information?
We are trying to use this Page component inside another existing application. As this application already has a main tag in it it gives us accessibility issue as a web page should not have multiple main tag. Hence we need this improvement