ID of the model to call.
e.g., "anthropic.claude-3-sonnet-20240229-v1:0". This is equivalent to the
modelID property in the list-foundation-models api. For custom and provisioned
models, an ARN value is expected. See
https://docs.aws.amazon.com/bedrock/latest/userguide/model-ids.html#model-ids-arns
for a list of all supported built-in models.
