Option to ignore unspecified keys when using shouldEqualJson matcher

[Kantis]

I'd like an option for shouldEqualJson to ignore keys in actual that are unspecified in expected. It should probably be included for shouldNotEqualJson as well.

I think this could be achieved either by:

• Expanding CompareMode with new modes: CompareMode.StrictIgnoringUnknownKeys and CompareMode.LenientIgnoringUnknownKeys
• Adding a new flag to matcher signatures: ignoreUnknownKeys: Boolean
• New matcher: shouldEqualSpecifiedJson? Better names? 😅

Following example should pass:

"""{ "a": 5, "timestamp": "2021-05-28T14:44Z" }""".shouldEqualJson("""{ "a": 5 }""", ignoreUnknownKeys = true) 
"""{ "a": 5, "timestamp": "2021-05-28T14:44Z" }""" shouldEqualSpecifiedJson """{ "a": 5 }"""

[Kantis]

Starting a branch for this in my fork feature/kantis/2298-json-ignore-unknown ✌🏼

[stale]

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