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This PR adds a devcontainer.json to aid in the development of node / guardian code. While development is currently possible in Linux (including WSL on Windows), providing this container adds an option for non-WSL Windows and ARM (M-series) Mac users which only requires Docker and VS Code. It also shares the same dockerfile used in CI for added assurance of compatibility. Relevant to #4031. Please note, this dockerfile explicitly specifies amd64, which means it will run via qemu or rosetta (depending on your Docker settings) - as far as I understand, the cosmwasm dependency (and possibly others) requires this and there will be a slight performance hit, but it is useable.