Feature Request: Get size for all modules

**Is your feature request related to a problem? Please describe.**
As we are creating more dynamic modules in the app, it now becomes challenging to track the size of all modules when they are introduced.

**Describe the solution you'd like**
In `get-size total` command, support `--all-modules` to calculate the size of all install-time and downloadable modules.

**Describe alternatives you've considered**
The alternative is to list each module specifically, which is not scalable for large organizations.
Note: #123 describes a different scenario and is a different request.