Is your feature request related to a problem? Please describe.
Use case: I clone a repo containing plenty of puspecs, some nested. Tons of analysis errors are surfaced. e.g. flutter/samples

Describe the solution you'd like
Clicking the button in the "Some packages are outdated. Run Flutter pub get" notification does pub get recursively, rather than at the top level and for example directories.

Describe alternatives you've considered
The alternative are various, but it'd be nice if the extension did it without me thinking.