feat: added optional extent for the registerProjection function

[santilland]

Implemented changes

This PR adds extent as an optional third parameter to the registerProjection function. This allows setting the validity extent for the set projection. Details see the corresponding OL docs.

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• I have added a test related to this feature/fix
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[lubojr]

as per eodash v4 implementation, approve

[silvester-pari]

Thanks for this addition, please add some description to the PR, and ideally we would also include the extent in a test. I'll see if I can prepare something in this regard! Edit: it isn't much effort to add a very basic test (like passing the extent and then checking with getExtent, but this is probably not too useful), but didn't get further due to lack of projection knowledge...

Question: is the extent parameter only relevant for registerProjection(), or also for registerProjectionFromCode()?