[PMSH] Define filter enhancements for PMSH

In R6, PMSH microservice was introduced and allowed for filtering of subscriptions by "nfName". 

In R7, as per [PA5|https://ericsson.sharepoint.com/:p:/r/sites/PNFStudy2/_layouts/15/doc2.aspx?sourcedoc=%7B1D988452-7BB5-427F-A0A0-1FA3FF7B7C6E%7D&file=PMcontrol_enhancments_PA5.pptx&action=edit&mobileredirect=true&cid=1731f948-7a8c-4e54-b8aa-d5b47ecb02a9] :

1) Current PNF_name filter will change from mandatory to optional

2) Added optional filter for Resource Name (model-name in AAI)

3) Added optional filter for Invariant UUID (model-invariant-id in AAI)

4) Added optional filter for UUID (model-version-id in AAI)

5) Available filter combinations:

• PNF_Name
• PNF_Name + Invariant UUID
• Invariant UUID
• PNF_Name _ Invariant UUID + UUID
• PNF_Name + UUID
• Invariant UUID + UUID
• UUID
• PNF_Name + Resource Name
• Resource Name