feat: lonLatCenter & lonLatExtent

[RobertOrthofer]

Implemented changes

This PR adds the read-only-properties EOxMap.lonLatCenter and EOxMap.lonLatExtent, which return the current center and extent in EPSG:4326, no matter the current projection of the view.
Additionally, the new methods transform and transformExtent are now exposed, allowing more flexible transformations between all registered coordinate systems. Basically, these methods are the ol/proj transform and transformExtent functions, with the small adaptation that the destination defaults to EPSG:4326 if not defined.

Screenshots/Videos

Checklist before requesting a review

• I have performed a self-review of my code
• I have added a test related to this feature/fix
• For new features: I have created a story showcasing this new feature
• All checks have passed
• The PR title follows conventional commit style and reflects the type of change (major/minor/patch, breaking)
• The PR title describes the change within this element (each merged PR equals one entry in the element's changelog!)

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[silvester-pari]

Again, here it would be nice to have a story showcasing this. ☑️ done

Plus, some description/documentation for the API docs: ☑️ done

[silvester-pari]

I added a very basic story showcasing this, but probably better than nothing.

[RobertOrthofer]

Thanks for the story. We should do documentation of all utility functions in the same place, once they are all exported. They probably don't need a map in their story

[santilland]

Initial integration tests showed a small issue that was corrected, further tests seem to work as expected, so i think this is good to go!
Thank you @RobertOrthofer for the implementation!