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Retire TwoStage regridder? #57

Description

@hdyson

✨ Feature Request

Requirements

Iris-esmf-regrid now has ​support for non-degree coordinate reference systems. This gives us a path to retire the TwoStage regridder.

This would mean replacing existing regridding calls to the TwoStage regridder with calls to the iris-esmf-regrid conservative regridder.

It would be good to take the opportunity to replace the existing calls to the iris linear and area weighted regridders with calls to the iris-esmf-regrid equivalents at the same time. This would align regular ANTS with UG-ANTS too.

A big advantage is that this would imply that a lot of our existing coordinate reference system could be retired - the only parts we would need would be the definitions of equivalent CRSs (e.g. treating WGS84 and UM_SPHERE interchangeably).

This feels like a sufficiently breaking change that it should be part of ANTS 4.x?

Context

Care will need to be taken to check how this interacts with the decomposition.

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