Add initial support for renaming

[fbricon]

We should add some refactoring options for renaming

• parameters
• fields. Getters/Setters are a special case
• methods
• classes (although my understanding is vs code/language server protocol doesn't support file renaming)
• packages

[gorkem]

see also eclipse-jdtls/eclipse.jdt.ls#43

[yaohaizh]

@fbricon @gorkem Could you guys help assign this one to me? I would like to work on this one.

[fbricon]

Initial support for renaming as landed. Because the language server protocol doesn't support renaming files, only renaming symbols is available now.

Renaming a class, will change the class name but won't rename the file, you'll have to fix the class/filename discrepancy manually.

Kudos to @yaohaizh for the contribution

[andreysaksonov]

@fbricon I observed that rename symbol for class also break imports in other files (instead of fqdn it places simple class name). Is it LSP issue or vscode-java?