Enum support for if else to switch cleanup

[carstenartur]

What it does

Adds support for enum to the cleanup in charge for refactoring chains of "if else" to switch.

How to test

Run the cleanup on code with if else chains or add junit test cases.

Author checklist

• [ ] I have thoroughly tested my changes
• [x] The change is following the coding conventions
• [x] I have signed the Eclipse Contributor Agreement (ECA)

[carstenartur]

Hi @jjohnstn, can you have a look? The build error might be unrelated, not sure.

[jjohnstn]

Thanks @carstenartur