Provide a way to access mini catalog for step extensions

[igarashitm]

Please describe the feature that you want to propose

Allow kamelet step extension to open up a kamelet mini catalog. https://github.com/KaotoIO/step-extension-repository/issues/884

[lordrip]

I think that we have what we need already, we need to create a step extension that consumes the step id parameter and makes the HTTP call. The only bit missing is to expand KaotoUI's API to provide this method already.