Elastic acoustic coupling

[Rohit-Kakodkar]

Description

This pull request implements elastic-acoustic coupling. Things included in this pull request :

• Read elastic-acoustic coupling parameters from the database

  • The read values are stored in mesh::coupled_interfaces

• Implement elastic-acoustic compute data interface (compute::coupled_interfaces)

  • The compute::coupled_interfaces namespace also provides helper functions to iterate over inter-facial edges

• Implemented compute_coupling routine to compute coupling interaction between different domains

  • The coupled_interfaces class is templated on 2 domains signifying self domain and coupled domains. The interface itself is divided into number of edges which are implemented as templated C++ class.
  • The compute_coupling routine provides a driver, describing kokkos parallelism, for the edge class
  • The edge implements the coupling physics at a GLL point on the interface (serial code).

Issue Number

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Checklist

Please make sure to check developer documentation on specfem docs.

• [x] I ran the code through pre-commit to check style
• [x] My code passes all the integration tests
• [x] I have added sufficient unittests to test my changes
• [ ] I have added/updated documentation for the changes I am proposing
• [x] I have updated CMakeLists to ensure my code builds
• [x] My code builds across all platforms

[Rohit-Kakodkar]

retest this please