Feature: Add a devcontainer definition to the repo

[mikeee]

Describe the feature/proposal

Add a devcontainer spec that includes:

• protobuf-compiler
• mechanical-markdown install
• rustup
• dapr cli / dapr init

Release Note

RELEASE NOTE:

[mikeee]

/assign

[github-actions]

🚀 issue assigned to you mikeee

[github-actions]

This issue has been automatically marked as stale because it has not had activity in the last 60 days. It will be closed in the next 7 days unless it is tagged (pinned, good first issue, help wanted) or other activity occurs. Thank you for your contributions.