Added frequency capping constraints to the personalized offer schema

[jshaik-adobe]

Frequency capping constraints define additional rules based on prior offer proposition, either across all audiences or for a particular profile identity.

What are the schemas that are affected by the issue

https://github.com/adobe/xdm/blob/master/extensions/adobe/experience/offer-management/personalized-content-offer.schema.json

What are examples of products that are impacted by the issue

No impact on the existing products. Frequency capping constraints define additional rules based on prior offer proposition, either across all audiences or for a particular profile identity.