Build/Test Tools: Add engines for default themes.

This adds the `engines` field to the `package.json` file for the three default themes with build processes in order to encourage consistent tooling for contributors.

Some minor dependency updates for these themes are also included in this change.

Props jorbin, joemcgill, swissspidy.
See #59663.

git-svn-id: https://develop.svn.wordpress.org/trunk@57213 602fd350-edb4-49c9-b593-d223f7449a82

Author: desrosj