[FEATURE] Implement Throttling for Max Workflows to be created

[owaiskazi19]

Is your feature request related to a problem?

Currently, we don't have a provision to limit the number of workflows(documents) to be saved in Global Context index. The size of the index can be large and thus can impact the memory of the cluster. To avoid this a limit should be added which would let the user know the maximum limit to create the workflows has been reached. A setting should handle the maximum limit, which can be dynamic and can be increased if requested.

What solution would you like?

Before saving the workflows using the Create API, throttle the request and return an error message to the user.

Do you have any additional context?

Dynamic Setting would look like the below

 Setting.intSetting(
        "plugins.flow_framework.max_workflows",
        100,
        0,
        1000,
        Setting.Property.NodeScope,
        Setting.Property.Dynamic
    );

Where 100 is the default value, 0 is the min value and 1000 is the max limit. Need input on what will be the best values for all of them.