Should provide create types for unresolve types(class) quick fix

[yaohaizh]

With new resource operation, this should be doable.

[fbricon]

@yaohaizh can you start looking into this one?

[fbricon]

@yaohaizh @testforstephen any chance you guys can work on this one for the next release?

[Eskibear]

I'm starting to work on this recently. I find there's only one NewCUUsingWizardProposal where the "create types" logic is coupled with the UI.

I think this can be done by two steps:

• refactor eclipse.jdt.ui to extract core code from UI. (jjohnstn is doing the refactoring work)
• 🏃enable related quickfix proposals Support to create unresolved type via QuickFix #1122
• Refactor related utilities Refactor ChangeUtil: universal API converting Change to WorkspaceEdit #1106 Refactor to support ChangeCorrectionProposal #1104

Use cases should cover:

• create simple class/enum/interface/annotation in the same package.
  • e.g. create Person when fixing Person p = new Person()
• create type in corresponding package.
  • e.g. create Person in package foo.bar when fixing foo.bar.Person p = new foo.bar.Person()
• create inner type.
  • e.g. create inner type Person in CurrentClass when fixing `CurrentClass.Person p = new CurrentClass.Person()'