Add .devcontainer configuration files

[kenibrewer]

A devcontainer configuration file in a repository defines a development environment encapsulated within a container. This containerized environment offers several benefits, including consistent tooling and dependencies, streamlined collaboration, efficient onboarding, and enhanced automation for seamless development, testing, and deployment processes.

To accelerate collaboration on DIMPL v2, we should define a devcontainer that can be used that will include the ability to run both the python code and nextflow pipelines that will be defined.