Add option to not clear screen when building extensions

[GuyShane]

Describe the Improvement

It would be nice when building extensions in a docker environment for the CLI not to clear the screen on every change. Maybe just an option in the command like directus-extension build --no-clear.

As for as I can see, the relevant sections would be:
https://github.com/directus/directus/blob/main/packages/extensions-sdk/src/cli/run.ts#L27
https://github.com/directus/directus/blob/main/packages/extensions-sdk/src/cli/commands/build.ts#L490

Just not sure how you would like to pass the option down into the watchExtension function.