Add a "namespace" label to help group kamelets

[lburgazzoli]

As today we have a kamelet.group label that is used to group related kamelets together:

camel.apache.org/kamelet.group: "AWS Cloudwatch"

It would be nice to add an additional label to define a larger group of related kamelets, like kamelet.namespace:

camel.apache.org/kamelet.namespace: "aws"

[lburgazzoli]

/cc @nicolaferraro @oscerd

[oscerd]

Makes sense

[lburgazzoli]

or maybe review how the group is used and i.e instead of AWS Cloudwatch, just use AWS ?

[oscerd]

Originally it was done in that way because if we had multiple kamelets for the same AWS service, they would have been filtered in the site view. But yeah, makes sense too

[lburgazzoli]

or maybe we can use a convention like kamelet.group is always like namespace [+ kind] so in the case of AWS Cloudwatch,

namespace = AWS
kind = Cloudwatch

[oscerd]

I think it should work in this way, I'm not sure if the annotations are currently used in camel-k too, need to have a look.