Warning when the VSCode extension version is older than the Prisma CLI or Client in use in the project

[janpio]

When you are using an older VSCode extension version than your local CLI or Client, you can get into situations where the extension complains about e.g. missing preview feature requests that are indeed supported by your project already, leading to confusion.

We should warn when this is the case and help the user to figure things out.

Random example: https://prisma.slack.com/archives/CA491RJH0/p1624975320311300?thread_ts=1624974170.308800&cid=CA491RJH0

[janpio]

A thread full of recent examples: https://github.com/prisma/prisma/issues/11985

Just showing somewhere in the VS Code UI (and log output) would make this much less common probably.