💡 [Feature]: Create a .devcontainer for SPFx solution

[Adam-it]

🎯 Aim of the feature

The extension could check if the current project has a .devcontainer and if not it could suggest generating one. Also this could be added as a new action (similar like the pipelines).
The added devcointaner could be based on those created in the pnp script sample repo.

🤔 Additional remarks or comments

We should recheck if the docker image used in the container may set any kind of SPFx version

Also we could first focus on this CLI for M365 issue to extend this as a new command in CLI first and then create it as a new action in viva toolkit
pnp/cli-microsoft365#3098

[Adam-it]

moving this to v4