v3.0.0-rc

Read the discourse post: https://community.redwoodjs.com/t/redwood-v3-0-0-rc-is-now-available/3836.

Diff

v2.2.3...release/major/v3.0.0

PRs

https://github.com/redwoodjs/redwood/pulls?q=is%3Apr+is%3Amerged+milestone%3Av3.0.0