[#581] Auth types/identity provider settings cannot be configured per organization

[roberlander2]

Description

This PR removes model.AuthType and model.IdentityProviderConfig and moves their data into model.ApplicationOrganization.AuthTypes to allow configuring by application and organization. It also adds a function to run on database start only one time that refactors account, login session, and credential documents to match these changes.

Resolves #581

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[petyos]

It looks good to me.

[shurwit]

We have added additional requirements to the issue here: #581 (comment)