Fm/task/unst 9773 meteo reader

[FlorisBuwaldaDeltares]

What was done

• meteo reader renamed to spatial reader
• split in file read, file validate, file process, enable quantity
• remove some unnecessary allocation routines
• new module m_spatial_field with type t_spatial_field_input to hold read input data
• added validator unit tests
• max search radius is now properly passed to the ec module
• max search radius is now reset to default if not user supplied!
• qext is now a special case (handled very differently from other quantities)

Evidence of the work done

• Video/figures
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• Clear from the issue description
• Not applicable

Tests

• Tests updated
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• Not applicable

Documentation

• Documentation updated
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• Not applicable

Issue link