Add verify script to limit SC election bios to 300 words
Add verify script to limit SC election bios to 300 words

The steering committee election policy states that all bios must be
limited to 300 words. This commits adds a verify script to check this.

Some bios from 2017-2020 exceed this limit so the script explicitly
avoids looking at the past elections.

kubernetes/community,kubernetes/community,kubernetes/community