Enable the Companies feature automatically for Chatwoot Cloud accounts
on the Business plan and higher.
## Closes
None.
## How to test
Upgrade or reconcile a Cloud account on Business or Enterprise and
verify Companies is available. Reconcile a Startups account and verify
Companies remains disabled.
## What changed
- Added companies to the Business plan feature set, which Enterprise
inherits through the existing hierarchy.
- Added billing specs that assert Companies is disabled for Startups and
enabled for Business and Enterprise.
