Considering our abstract class JSONPathSelector, and the absence of a JSONPathSegment class, we are currently blurring the lines between segments and selectors.

We should refactor to follow the JSONPath model described in RFC 9535 by implementing a JSONPathSegment class, where all JSONPathSelector instances belong to a segment, even shorthand selectors. In turn, a JSONPath expression (currently JSONPath and should be JSONPathQuery or JSONPathExpression to match terminology from RFC 9535) should be made up of segments only.

This diagram illustrates what we want.