Expose environment settings in GUI page via endpoint

[hanstrompert]

[Mark90]

Which settings do we want to expose?

• app_settings from the orchestrator-core
• oauth2lib_settings from oauth2_lib
• Settings object in the user's orchestrator implementation

Requirements:

• Sensitive orchestrator-core settings with type str should be changed to pydantic.SecretStr (and any usages changed to .get_secret_value())
• The endpoint should exclude settings with types that may have sensitive information (PostgresDsn, RedisDsn)
  • Or try to reformat them and censor the password
• Make core endpoint extendable/reusable from user's orchestrator implementation (ideas: extendable list in core, register function on app object, custom endpoint in user orchestrator, ...)
• Create a graphQL endpoint for this.