[Shared Infra] Add support for access control server and IdentityProvider

[lulf]

Description

Add support for access control server and IdentityProvider based on #4391

Tasklist

• [x] Build AMQP SASL authentication server engine (accepting, disapatching, AMQP performatives)
• [ ] Cache IdentityProviders/MessagigEndpoints/MessagingUser/MessagingRole/MessagingRoleBinding
• [ ] Use SNI information to resolve correct MessagingEndpoint and IdentityProviders to be process authentication
• [x] Build SASL engine
• [ ] Provider impl - MessagingUser
• [ ] Provider impl - ServiceAccount
• [ ] Provider impl - Anonymous
• [ ] Provider impl - Keycloak
• [ ] Provider impl - LDAP
• [ ] Provider impl - TLS client cert
• [ ] Implement authorisation engine
• [ ] Maintain IdentityProvider status section (external identity provider status - how will this work when scaled??)
• [ ] Expose health endpoints and metrics

[lulf]

@k-wall I don't think this was supposed to be closed yet :)