get issm exports in landice tile space

[weiyuan-jiang]

Since ISSM's exports are on mesh-like locstream, the variables on landice-tile space cannot be exported. This PR uses internal state to pass the variables from ISSM gridcomp back to landice gridcomp and use landice's export for history output. @agstub , this PR is not done. I have left some place for you to implement. Please take a look and let me know your concerns.

[github-actions]

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[agstub]

so the "whatever" here should have the (local) size of landice tiles? So the idea is I can transform between mesh and landice tiles like before (with ESMF_FieldRegrid and MAPL_LocStreamTransform), set the landice tile version in this new internal state, then recover these pointers via internal state in the landice gridcomp? Am I thinking about it right?

[weiyuan-jiang]

so the "whatever" here should have the (local) size of landice tiles? So the idea is I can transform between mesh and landice tiles like before (with ESMF_FieldRegrid and MAPL_LocStreamTransform), set the landice tile version in this new internal state, then recover these pointers via internal state in the landice gridcomp? Am I thinking about it right?

Yes, that is local size