Use multi-field ClimaCore Remapper

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CliMA/ClimaCore.jl#1669 adds support to remapping multiple fields at the same time. Remapping multiple fields at the same time trades space/time: it is faster, but it requires more memory.

Supporting this requires:

Tasks

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1. Add a new function interpolate_fields!
2. Change the internal structure of the NetCDF writer to be indexing diagnostics over their space, including the preallocated areas of memory
3. Make the relavent changes in orchestrate_diagnostics