[INFRA] fix mxgraph-type-definitions impediments

[tbouffard]

Integration issue to be solved or consider them as mxgraph-type-definitions issues

• unable to use mxClient. See mxgraph-type-definitions https://github.com/hungtcs/mxgraph-type-definitions/issues/28 and https://github.com/hungtcs/mxgraph-type-definitions/issues/29
• mxGraph types are global and there is no need to import them
• definition files of bpmn-visualization: unresolved mxGraph types because they are not referenced in the produced definitions
  • see https://www.typescriptlang.org/docs/handbook/declaration-files/publishing.html#dependencies and decide if mxgraph-type-definitions must be declared as dependency instead of devDependency

[tbouffard]

The impediments can be fixed by using https://github.com/typed-mxgraph/typed-mxgraph wich requires to use the mxgraph npm package. Remember that mxgraph-type-definitions is now deprecated in favor of typed-mxgraph. Using the npm package should also solve #478