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!

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