Allow specifying user roles for ApiKey and Basic Authentication

[marcominerva]

Currently, SimpleAuthentication allows configuration for ApiKey and Basic authentication schemes, including specifying fixed API keys and credentials. However, there is no way to specify the list of roles for a user when using these methods.

Requested enhancement:

• Add a Roles parameter (array of strings) to both ApiKey and Basic authentication configuration sections.
• When validating credentials (ApiKey or Basic), if Roles is specified, automatically populate the role claim for the corresponding user.
• The Roles list should be optional; if omitted, no roles are assigned.
• Update the README.md file to document this feature, including examples for both configuration and expected claim population.

Example configuration:

"Authentication": {
    "ApiKey": {
        "ApiKeys": [
            {
                "Value": "key-1",
                "UserName": "UserName1",
                "Roles": ["Admin", "User"]
            }
        ]
    },
    "Basic": {
        "Credentials": [
            {
                "UserName": "UserName1",
                "Password": "Password1",
                "Roles": ["Manager"]
            }
        ]
    }
}

This enhancement will provide more fine-grained control over user claims and simplify role assignment for fixed credentials.

• Update configuration schema and validation logic
• Populate role claim from the Roles array
• Update documentation (README.md)