[SR-6297] Refactoring action to move methods to extension

[ahoppen]

Previous ID	SR-6297
Radar	None
Original Reporter	@ahoppen
Type	New Feature
Status	Closed
Resolution	Done

Additional Detail from JIRA

Votes	0
Component/s	Source Tooling
Labels	New Feature, Refactoring
Assignee	@ahoppen
Priority	Medium

md5: 5a7e088b617453915d73b969f7f96685

Issue Description:

Add a range-based refactoring action that moves selected members of a nominal type to a new extension of that type.

class Foo {
  func foo() {
  }
  func bar() {
  }
}

to

class Foo {
  func foo() {
  }
}

extension Foo {
  func bar() {
  }
}