Organization: add null constraints and update org create service

[kasugaijin]

Please add null constraints on organizations table in the database for name, slug, email and then update then add email attribute to the Organizations::CreateService when creating an Organization.

Also on the Organization model, we need to validate:
name for presence
slug for presence and also do not allow any characters that are forbidden in URLs. Look into options for validating this slug.
email for format, presence.

[Gabe-Torres]

Seems like a fun one! I'll take it

[kasugaijin]

@Gabe-Torres all yours!

[github-actions]

This issue is marked as stale due to no activity within 30 days. If no further activity is detected within 7 days, it will be unassigned.

[github-actions]

Automatically unassigned after 7 days of inactivity.

[coalest]

Looks like this task was completed with #918. Can this issue be closed?