.Net: Add vector size property in Amazon Connectors

[dziedrius]

AWS Titan embeddings allow to create embedding vectors of different size, currently there's no way to ask for desired size using Semantic Kernel.

We need to set only one property - dimensions when doing the request, as longs as I could not find an actual way how to extend Semantic Kernel (to be fair I was surprised how closed for extension it is), this is just example of what is needed.

I saw OpenAI connector already supports this.

[dziedrius]

Seems to be not needed anymore, as it is covered with new IEmbeddingGenerator implementation, tested like this:

var builder = Kernel.CreateBuilder();
builder.AddBedrockEmbeddingGenerator("amazon.titan-embed-text-v2:0");

var kernel = builder.Build();
var generator = kernel.GetRequiredService<IEmbeddingGenerator<string, Embedding<float>>>();

var response = await generator.GenerateAsync(["test string"], new EmbeddingGenerationOptions
{
    Dimensions = 256
});

Hence I think the issue might be closed.