Enable public application OIDC client support

[twsouthwick]

Category:

Feature

Overview
This change uses oidc-client-ts to enable dashy to authenticate as an OIDC client. It populates the groups and roles so that it can be used the same as keycloak for showing/hiding elements on the dashboard.

Issue Number #823

New Vars

• Added config options for appConfig:auth:oidc
• Added oidc-client-ts as a dependency

Code Quality Checklist (Please complete)

• All changes are backwards compatible
• All lint checks and tests are passing
• There are no (new) build warnings or errors
• (If a new config option is added) Attribute is outlined in the schema and documented
• (If a new dependency is added) Package is essential, and has been checked out for security or performance
• Bumps version, if new feature added

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[Lissy93]

Hey @twsouthwick
So sorry for the delay in reviewing this, it looks awesome!
Really well written! I'm just testing it out now, and will merge shortly :)