Allow adding AMS layers even if project has no CRS

[m-kuhn]

The uri for AMS layers are separated by spaces instead of the usual &.
No surprise that hacks are not that robust.

Fixes #38892

[nyalldawson]

This is super fragile -- it breaks CRS which are defined using wkt strings alone. Oh well, that's not a regression introduced here...!

[nyalldawson]

Actually this code and logic in crsAndFormatAdjustedLayerUri is horrible in general...!

[m-kuhn]

I agree. Do you want to propose a better API?

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[stale]

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