Bounded values

Zebedee Nichollsrequested to merge
bounded-values into main

Description

Adds the ValuesBounded class. I think this is what we need to get ourselves through and it offers all the information we actually need. I will follow up with another PR to use this in solve IVP before fixing up !55 (merged) and !56 (merged).

Checklist

Please confirm that this pull request has done the following:

  • Tests added
  • Documentation added (where applicable)
  • Changelog item added to changelog/
Edited by Zebedee Nicholls

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