Part 5: Add table of x-ogc- properties

[m-mohr]

I think it would be valuable to add a table of all the pre-defined additions to JSON Schema, i.e. with the x-ogc- prefix.
It would help to understand schemas more easily, especially as some schemas consist of more proprietary properties than JSON Schema vocabulary.

PS: Generally, it feels like the number of additions to JSON Schema is a bit excessive.

[pvretano]

SWG Meeting 29-JUL-2024: Yes, all present agreeds that a table of x-ogc- values would be useful. @pvretano will add.

[jerstlouis]

In addition to having a table in the Standard, it might be worthwhile to set up some kind of registry so that additional fields can be registered for different use cases, after the Standard has been published. cc. @rob-metalinkage @avillar