Add initial devcontainer configuration

[Semsemq]

Note

Introduces .devcontainer/devcontainer.json using mcr.microsoft.com/devcontainers/universal:2.

^{Written by Cursor Bugbot for commit c4195e0. This will update automatically on new commits. Configure here.}

[vercel]

@Semsemq is attempting to deploy a commit to the Consensys Team on Vercel.

A member of the Team first needs to authorize it.