[#523] Support for OAuth 2.0 Access Tokens

[roberlander2]

Description

This PR adds support for generating ROKWIRE access tokens using OAuth 2.0 access tokens. It also fixes bugs related to application and organization cache updates and adds a redirect_uri field to identity provider configs.

Resolves #523

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[petyos]

It looks good to me.

[shurwit]

We would like to support the state param for OIDC as well. This should be added before we merge this PR.

[shurwit]

Thanks @roberlander2, LGTM!

@petyos, I saw that you previously approved this but feel free to take a quick glance at the additional changes we made. Thanks!