Introduce new authenticator property: DefinedBy

[Thisara-Welmilla]

Feature

• Support for external custom authention extension #20809

A new authenticator property, DefinedBy, will be introduced to indicate whether the authenticator is system-defined or user-defined. This property can take one of the following values:

• USER: Indicates a user-defined authenticator, such as custom authenticators, which authenticate users through an external authentication service.
• SYSTEM: Represents system-managed authenticators. All existing authenticators fall under this category.

Tasks:

• Update the database schemas by adding a new column DEFINED_BY to the IDP_AUTHENTICATOR table to store this property.
• Update the relevant database queries and update their usages to accommodate the new column.
• The impact of database migration.
• Update the LocalAuthenticatorConfig and FederatedAuthenticatorConfig classes to include the DefinedBy attribute in the authenticator configuration.
• Add the DefinedBy attribute for ApplicationAuthenticator instances.

[Thisara-Welmilla]

Related PRs:

• Add new authenticator property. carbon-identity-framework#5937
• Add new authenticator property. identity-api-server#664