Iris

Implementation plan **Engine** https://github.com/finos/legend-engine/pull/759 - [x] Fix Engine roundtrip process. Currently, /pure/v1/grammar/jsonToGrammar/model will add one new ### Pure among each overloaded functions like below e.g. ``` function model::test(a: String[1]): String[1]...

> Isn't it the case of engine that we will change grammar parser to correctly generate the right packageable element now? Yes, update parser will fix the current behavior.

> To clarify, for `sdlc` (1) and (2) are quick hacks, (2) is stricter and less hacky than (1). (3) is a more generic approach proposed by @kevin-m-knight-gs to handle...

As we discussed, we should also support: - [ ] Add support for mapping subtypes in mapping editor UI - [ ] Enhance the mapping algorithm to take care of...

> Please also test the enum parameters, model for reference