Improve usability w.r.t Elmer vs. preCICE data names

[BenjaminRodenberg]

The following piece of code in the adapter is not ideal and con lead to a lot of confusion:

https://github.com/precice/elmer-adapter/blob/main/Adapter/Coupler_Solver.F90#L324-L330

We implement a very specific mapping of some data names (in "Elmer language") to other specific data names (in "preCICE language"). The motivation for this mapping is that Elmer expects certain naming patterns (and I believe case-sensitivity is also an issue) while preCICE configuration files may come with conflicting conventions.

I think it would be more transparent and flexible to let the user provide an adapter configuration file with a dict-like format. For the partitioned-heat equation we could, for example, allow the user to define the following mapping for the Dirichlet participant:

{
    'write_data': [('temperature flux_abs', 'Heat-Flux')],
    'read_data':[('temperature', 'Temperature')]
}

We could potentially extend the following section in the sif file:

elmer-adapter/Partitioned_Heat_Conduction/Dirichlet_Participant/case.sif

Lines 22 to 25 in 5fde019

	maskName = String "Coupler Interface"
	participantName = String "Dirichlet"
	meshName = String "Dirichlet-Mesh"
	configPath = String "../precice-config.xml"

Implementing such a mapping would allow the user (and the adapter code) to consistently follow Elmer conventions and we would perform the mapping from Elmer-names to preCICE-names only when calling preCICE API functions by using the dict from above.

[uekerman]

Please try following the adapter schema already now if you change things or raise a discussion if the adapter schema does not fit what you need 😁

https://github.com/precice/preeco-orga/blob/81708ec5c71c8ea87c41e9271b1acdc02b37179a/adapter-config-schema/preatcs.json#L90-L106

[tapegoji]

We can use File instead of String in the elmer sif file. this way Elmer respects case sensitivity.

For example:
meshName = File "Dirichlet-Mesh" instead of meshName = String "Dirichlet-Mesh"

This does not mean that Elmer looks for a file. I know, It's a bit strange.