For "binding create" multiple namespace options are required

Currently, there is only a single `--namespace` option when creating a KameletBinding. However, there are multiple namespace fields that can be set:

* THe namespace of the binding itself
* The namespace of the `source:` ref
* The namespace of the `sink:` ref

Currently, the specified namespace is used for all three fields. Since cross-namespace references are not allowed, this often is not a problem. However, when referring to default Kamelets from the system namespace, there must a namespace set on the reference (as it would violate the "cross-namespace" constraint).

Maybe add something like `--namespace-source` and `--namespace-sink` ?

Start at the `binding create` command and trace how the current `--namespace` option is applied to the binding, source reference, and sink reference. Define separate source and sink namespace options, then verify that each namespace is assigned to the intended reference, including references to default Kamelets in the system namespace.

Written by the indexing model from the issue text.