message: feature(plugins-flow-server) Accumulating the functions used in links
diff: -import { typeMapper } from '@flogo-web/server/core';
  +import { isEmpty } from 'lodash';
  +import { EXPR_PREFIX } from '@flogo-web/core';
  +import { typeMapper, allFunctionsUsedIn } from '@flogo-web/server/core';
  import { FLOGO_FLOW_DIAGRAM_FLOW_LINK_TYPE as LEGACY_LINK_TYPE } from '../constants';
  export function formatLinks(links = []) {
  @@ -8,6 +10,11 @@ export function formatLinks(links = []) {
  fromLink.type !== LEGACY_LINK_TYPE.DEFAULT
  ? stdTypeMapper.linkTypes[fromLink.type]
  : undefined;
  + if (!isEmpty(fromLink.value)) {
  + const functionsUsed = allFunctionsUsedIn({
  + condition: EXPR_PREFIX + fromLink.value,
  + });
  + }
  return {
  ...fromLink,
  id: undefined,
  