syndesis Retrieve field action metadata and feed into datamapper step

This is a...


[x] Feature request
[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report  
[ ] Documentation issue or request

The problem

To achieve #204 we need to generate FieldActions metadata and deliver it into datamapper UI. With #2936 and #3302 implemented, field action metadata including custom field action in the extension should be available via REST endpoint. UI needs to deliver them into datamapper step so that custom field actions can show up.

Example FieldAction metadata

{
  "ActionDetails" : {
    "actionDetail" : [ {
      "name" : "Capitalize",
      "className" : "io.atlasmap.actions.StringSimpleFieldActions",
      "method" : "capitalize",
      "sourceType" : "STRING",
      "targetType" : "STRING",
      "sourceCollectionType" : "NONE",
      "targetCollectionType" : "NONE"
    }, {
..........
    }, {
      "name" : "DummyFieldAction",
      "custom" : true,
      "className" : "io.atlasmap.maven.test.DummyFieldActions",
      "method" : "dummy",
      "sourceType" : "BYTE",
      "targetType" : "NUMBER",
      "sourceCollectionType" : "MAP",
      "targetCollectionType" : "ARRAY"
    } ]
  }
}

Drop off location

fieldActionMetadata on ConfigModel https://github.com/atlasmap/atlasmap/blob/59ddca8b73d74b47b685f48725521d50d695112d/ui/src/app/lib/atlasmap-data-mapper/models/config.model.ts#L148