Support for simple, linear integration definitions

[lburgazzoli]

With the introduction of the Kamelet EIP in Camel, we could introduce a new way to define simple, linear integrations, like:

steps:
  - kamelet: 
     name: foo
     properties:
       a: b  
  - kamelet:
     name: bar
     properties:
       c: d

This could be particular useful for the materialization of a KameletBinding to a real integration so the camel-k operator does not need to care about things such as proper placement of from, to, etc.

[lburgazzoli]

/cc @nicolaferraro

[lburgazzoli]

Mode to JIRA https://issues.apache.org/jira/browse/CAMEL-16652