.Net Simplify configuration by ServiceId on Multi Model Scenarios.

[RogerBarreto]

Motivation and Context

Setting multiple execution settings is not simple and demands creating a dictionary on the caller side to set directly into the ExecutionSettings setter property.

This change adds a ServiceId property to the execution settings which will be used during the initialization and deserialization to set the expected Key in the dictionary as well as the setting for filtering and executing a service specific function invocation.

With this change were also added new constructors for PromptTemplateConfig, KernelArguments accepting multiple PromptExecutionSettings as well as added multiple for Kernel.CreateFunctionFromPrompt and KernelFunctionFromPrompt.Create

ServiceId Settings

Before:

KernelArguments arguments = [];
arguments.ExecutionSettings = new Dictionary<string, PromptExecutionSettings>()
{
    { serviceId, new PromptExecutionSettings() }
};
var result = await kernel.InvokePromptAsync(prompt, arguments);

After:

var result = await kernel.InvokePromptAsync(prompt, new(new PromptExecutionSettings { ServiceId = serviceId }));

ModelIds Settings

Before:

string[] modelIds = ["model1", "model2", ...];
var modelSettings = new Dictionary<string, PromptExecutionSettings>();
foreach (var modelId in modelIds)
{
    modelSettings.Add(modelId, new PromptExecutionSettings() { ModelId = modelId });
}
var promptConfig = new PromptTemplateConfig(prompt) { Name = "HelloAI", ExecutionSettings = modelSettings };

var function = kernel.CreateFunctionFromPrompt(promptConfig);

After:

string[] modelIds = ["model1", "model2", ...];
var function = kernel.CreateFunctionFromPrompt(prompt, modelIds.Select((modelId, index) => new PromptExecutionSettings { ServiceId = $"service-{index}", ModelId = modelId }));

The same can be done for ServiceId settings:

string[] serviceIds = ["service1", "service2"... ];
var function = kernel.CreateFunctionFromPrompt(prompt, serviceIds.Select(serviceId => new PromptExecutionSettings { ServiceId = serviceId }));

[markwallace-microsoft]

Some general feedback

1. When invoking a prompt a likely use case is that you want to target a specific modelId rather than serviceId. Can you include an example for this if we don't already have one.
2. If I want to invoke a prompt KernelFunction and specify the modelId or serviceId to use, do we have an example for this?

[RogerBarreto]

@markwallace-microsoft

When invoking a prompt a likely use case is that you want to target a specific modelId rather than serviceId. Can you include an example for this if we don't already have one.

Good point, I added all possible combinations of samples with PreConfigured and per Invocation and simplified a bit more the samples to 2 lines max.