sagemaker.model_monitor.Constraints.set_monitoring() method only allows disabling monitoring for string data

[mbbourgo]

Describe the bug
I want to override the constraint enforcement for a binary variable. However, the set_monitoring method of the sagemaker.model_monitor.Constraints object only allows that to happen for string-type variables with a string_constraints section. In addition, the method puts the override inside the string_constraints section, contrary to what the official documentation says it should do.

To reproduce

• Create a baseline for binary data called Churn
• Get the constraints object: suggested_constraints = baseline_job.suggested_constraints()
• Set the desired property: suggested_constraints.set_monitoring(False, feature_name="Churn")
• Observe the error about the lack of a string_constraints section.

Expected behavior
The Churn variable's constraints gets a monitoring_config_overrides section that includes the value pair "evaluate_constraints": "Disabled".

Screenshots or logs
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System information
A description of your system. Please provide:

• SageMaker Python SDK version: 1.18.51
• Framework name (eg. PyTorch) or algorithm (eg. KMeans):
• Framework version: 3.7
• Python version: 3.7
• CPU or GPU: CPU
• Custom Docker image (Y/N): N

Additional context
Add any other context about the problem here.