This commit introduces an abstraction that allows to convert HTTP inputs to a data type based on a set of HttpMessageConverter. Previously, the AssertJ integration was finding the first converter that is able to convert JSON to a Map (and vice-versa) and used that in its API. With the introduction of SmartHttpMessageConverter, exposing a specific converter is fragile. The added abstraction allows for converting other kind of input than JSON if we need to do that in the future. Closes gh-33148
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