[Federation] Policy language: New equals | set_equals value check

Purpose: To define equality checks for metadata parameters.

Example use case: Enforcing client_registration_types be equal to ["automatic"], “explicit” must not be supported.

Possible variants:

equals – applies to JSON entities that are strings, numbers, true|false, objects and arrays (arrays should be treated as sets, because the item order does not matter in present known metadata cases).
set_equals – applies strictly to JSON entities that are arrays

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Example, equals variant:

"client_registration_types" : {
    "equals": ["automatic"]
},
"application_type": {
    "equals": "web"
}

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Example, set_equals variant:

"client_registration_types" : {
    "set_equals": ["automatic"]
}

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