Grails. Add "Move Method" refactoring option.

We recently had to split a grails service in two separate classes and move the corresponding tests as well. This was difficult to do manually.

It should be possible to implement refactoring for moving a service method, since they are stateless. It should also be simple enough to automate the refactoring for moving a test method from a test class to another - since, again, these are typically stateless or use private fields or methods that are not referred from other classes.

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*Imported from [IDEA-141434](https://youtrack.jetbrains.com/issue/IDEA-141434) · Type: Feature · Votes: 1*
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No files, tests, or entry points are named. Start by locating the plugin's existing refactoring implementations and inspect how service and test classes are represented; define the supported move cases and verify completion with focused refactoring tests for moving service methods and test methods.

Written by the indexing model from the issue text.