Description of the desired feature

The block of code below is currently used seven times throughout PyGMT modules (probably more pending Will's PRs). Based on GenericMappingTools/gmt#5563 (comment), it may need to be used up to 34 times if we continue adding functions 1:1 with GMT modules. I think it would be useful to add an build_outgrid_args() method (or something similar) that can be used throughout to build the argument string using either outgrid or tempfile.name. I expect this would be simplest to implement as a new method in the Session class, although it could be a function in utils.

Edit: The original post only mentioned managing the input arguments to call_module, but the same can be applied to the output for the current default behavior of returning a DataArray if outgrid is not set:

Are you willing to help implement and maintain this feature? Yes