Initial NAMD Integration

[ljwoods2]

After IMDSessionInfo is implemented in NAMD it will be ready for initial integration testing with the client.

Add:

• namd_integration.yaml in .github/workflows
• imdclient/tests/test_namd.py
• Any input files/topologies/reference trajectories necessary for testing to imdclient/data & imdclient/tests/datafiles.py

Use:

• Base class for integration tests (feel free to modify): imdclient/tests/base.py

Reference:

• lammps_integration.yaml
• imdclient/tests/test_lammps.py

[orbeckst]

The NAMD GH runner fails (eg https://github.com/Becksteinlab/imdclient/actions/runs/12060391359/job/33630726079?pr=38 ) because the NAMD dev repo has been made private.

[orbeckst]

I think we should remove the NAMD workflow for the time being. Perhaps we can figure out a way to run it with docker container...