Add support for overriding model registry and capabilities

[srinathgs]

Hi,
I use an enterprise AI gateway with custom model aliases. When using kit, I found that the model’s capabilities cannot be updated with configuration parameters. It would be of great help if this is done!
Thanks!

[ezynda3]

@srinathgs Hi I think this latest update should work. Please have a look 329cd4e

v0.22.0

[srinathgs]

awesome. that works!

[ezynda3]

Awesome!