Expand parser and example generator to support more groups types

[ShiriMoran]

Expand parser and example generator to support groups types based on (only) IPs and groups based on (only) segments.
The representation of the IPs and Segments is the same as in the policies (of example generator).

Validate analysis is accurate with new group types added.

[adisos]

Detailed list of groups types examples to handle (WIP):

• Already supported for example-gen and analysis (need support in synthesis):

• group of type IP address (ex1, ex2)
• group of direct members defined as path to other group / segment (ex3)
• group with nested expr (ex4)

• more group types examples to add:

• Group with tag expr over segments rather than vms
• group with direct vm def based on ExternalIDExpression
• group def based on vif member
• group def based on ip addresses (group type is generic)
• group def based on segment port member
• group def based on ip set (in membership criteria)
• example of max criteria in expr (e.g. 5 conditions with OR between them)