Added capability to evaluate path queries in Patch Add operations.

[MartinHaeusler]

What does this implement/fix? Explain your changes.

The SCIM2 framework at the moment does not support path queries in PATCH operations if they occur within an "add" op. For example, the following PATCH operation would be invalid:

{
    "schemas": [
        "urn:ietf:params:scim:api:messages:2.0:PatchOp"
    ],
    "Operations": [
        {
            "op": "Add",
            "path": "addresses[type eq \"work\"].country",
            "value": "Austria"
        }
    ]
}

... because of the [type eq \"work\"] filter.

Does this close any currently open issues?

Yes: https://github.com/pingidentity/scim2/issues/135

[kqarryzada]

This functionality is now available in the 3.0.0 release, so I'm closing this PR.