[Feature Request] Add SAML auth provider

## Describe the solution you'd like

A way to declare a SAML authentication provider inside the project.

## Why the solution needed

I need to plug an Azure AD as a authentication provider inside the project. I need my use to be auth trough SSO AzureAd.

## Additional context

Aws complete begginer here.

## Implementation feasibility

Are you willing to discuss the solution with us, decide on the approach, and assist with the implementation?

- [x] Yes

The issue names no files, tests, or entry points. Start by mapping the project's existing authentication-provider configuration and checking how Azure AD SSO would fit the AWS-native application. Done means a project can declare an Azure AD SAML provider and users can authenticate through SSO.

Written by the indexing model from the issue text.