Added Organization to OAuth2.

[CallumJohnson]

Closes: #7209

This is an optional parameter on OAuth2 endpoints for 'Business Users' in OAuth2 applications.

This required affiliation with an organization, therefore requires this option to be specified on the request.

[CLAassistant]

All committers have signed the CLA.

[jackkav]

I wonder if it might be better to add a custom values table rather than a new hard coded key, I'll discuss with the team, thanks for your contribution!

[CallumJohnson]

Thanks for your quick response; a custom values table would be great for the OAuth2 flow.

[jackkav]

I saw in postman they have three phases with custom query params, would some like that satisfy your use case? Or am I misunderstanding something?

[CallumJohnson]

Absolutely, we're currently using the Auth Requests section to provide this context to our OAuth2 flow. Adding a table like this would be very powerful!

Thanks again for your response.