Add JSONPath selective validation to Comparator

[codemental]

The Comparator must be extended to accept another validation options. This option is about configuring it to only validate specific JSONPaths.
Just like in the other ticket, the JSONPaths that we will be supporting first will cover these cases:

$.store.book[0].title - target a specific field.
$..author | $.store..price - target a field with the specified name, wherever it is under a specific parent.
$.store.* - target all fields under a specific parent. $..* falls into this category, but I am curious of what use-cases this could cover.