620 product catalog jonathan

[hrodrigues-hestia]

changes regarding:

https://github.com/tmforum-rand/TMF620_Product_Catalog

No tests done.

[knutaa]

1. Suggest to not add trailing space after each property, e.g.
   "type": "string", (with trailing space)
   should just be
   "type": "string", (without the trailing space) - many similar examples

2. Suggest to use local references, e.g. keep

"$ref": "CategoryRef.schema.json#CategoryRef" 

and not introduce the navigation up and back again, not like

"$ref": "../product/CategoryRef.schema.json#CategoryRef"

3. Suggest to avoid unnecessary abbreviations, e.g. use long form and not abbreviations like PLA (Pricing Logic Algorithm)

4. Comment A JSON-Schema template for TM Forum entities #1 above is relevant also for the new schemas, not only for the modified schemas