In AngularFireFunctions allow for calling `httpsCallableFromURL`

[kaczors]

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Feature request

In AngularFireFunctions allow for calling httpsCallableFromURL (https://firebase.google.com/docs/reference/js/functions.md#httpscallablefromurl), similar to current call call to httpsCallable. With Firebase Cloud Functions V2 this is the only way for calling that new functions (since, they are still in preview mode: https://firebase.google.com/docs/functions/beta/callable#call_the_function).

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