Added docker development enviornment container to use with VSCode

[rwalkerlewis]

I put in a basic docker development environment that can be used with VSCode dev containers. The idea is that all the dependencies are packaged in the environment and changes can be made and pushed within the environment alone.

[rmodrak]

Hi Robert, thanks for this useful PR. I'd be interested to hear from seisscope container developers. Also if there is a way to avoid duplication between pyproject.toml and the newly added files?

[rwalkerlewis]

@rmodrak I see what you mean with regard to the pyproject.toml and have addressed this as best as I could. I made mpi4py an optional dependency in the pyproject.toml (can be removed and just manually installed when in the development environment if need be).

I also changed the netcdf output in grid_search.py to use the scipy engine as the default was throwing errors when running in parallel.