Support `saga` eip

[igarashitm]

Please describe the feature that you want to propose

There're roughly 2 things to do

1. It's a branching step, need a special handling just like filter. In addition to that, it has 2 parameters compensation and completion, both have uri and parameters to route to the arbitrary endpoint. We might be able to make these compensation and completion to be an artificial node/step in the canvas, then it will look similar with doTry-doCatch-doFinally.
2. option property is key-value pairs where the value is expression structure

   - saga:
   option:
     - key: prop1
       expression:
         simple:
           expression: ${header.prop1}
     - key: prop2
       expression:
         jq:
           expression: header.prop2
     - key: prop3
       expression:
         jsonpath:
           expression: /body/prop3

   It will be too chaotic to have a key-expression table in the right drawer form and show ExpressionEditor for each entry. It needs some layout separation.

[lordrip]

Maybe setHeaders might require a similar consideration.

[igarashitm]

https://github.com/KaotoIO/kaoto-next/pull/553 adds ExpressionField which adds a hyperlink to open a modal with expression configuration form. It automatically supports saga option expression as well.