Move anonymous Weight implementation in PointRangeQuery to named class

[jainankitk]

Description

The Weight implementation in PointRangeQuery#createWeight is anonymous class making it difficult to extend or reuse specific logic from the class. Not to mention the class being more ~400 lines of code which makes good case for named class anyways IMO.

[vijaykriishna]

Hello @jainankitk I've opened a PR for this task. Link is tagged to this issue. Please review.

[jainankitk]

@vijaykriishna - I had PR for this - #13711 open, but was unable to make further progress. Does your approach addresses the concerns raised by Adrien here - #13711 (comment)?