feat: enable/disable compare

[silvester-pari]

Implemented changes

This PR adds a new functionality to the eox-map-compare and allows to toggle the comparison mode via the new enabled attribute:

• enabled="first" only shows the first map
• enabled="second" only shows the second map
• enabled (undefined or any other truthy value; default) shows both maps

This effectively allows enabling/disabling the comparison in a flexible way.

Screenshots/Videos

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[santilland]

I really like this approach, it allows us to enable/disable comparison, but also easy implementation of a compare toggle button instead of a slider, from my side happy if this is merged!