Allow dynamic assumeRoleArn in Athena driver config

Apologies if there is another way to do this, but I tried multiple approaches with no results..

Is your feature request related to a problem? Please describe. The Athena driver only reads assumeRoleArn from environment variables. In multi-tenant setups, it is not possible to pass a tenant-specific assume-role ARN via the driver config.

Describe the solution you'd like Allow the driver to accept assumeRoleArn (and optionally assumeRoleExternalId) from the driver config, prioritizing it over the environment variable. Example:

@config("driver_factory")
def driver_factory(context):
  return {
    type: 'athena',
    database: '...',
    assumeRoleArn: 'arn:aws:iam::123456789012:role/cube-tenant-XYZ',
    assumeRoleExternalId: 'optional-external-id',
    accessKeyId: '...',
    secretAccessKey: '...',
    region: 'us-east-1',
    S3OutputLocation: 's3://...',
  }

Describe alternatives you've considered I tried to generate the credentials externally and pass it to the driver but this is also not supported.

Additional context This change would simplify multi-tenant deployments where each tenant uses a unique Athena role.