LSP Client: support renaming Files

Add renaming support to be able to rename QML components in the QML Language Server.

For example:

// A.qml
import QtQuick
Item {}

// B.qml
import QtQuick
Item {
    property A myProperty // renaming A implies renaming the A.qml file too!
}

The idea was to rename files using 'documentChanges' from a WorkspaceEdit (see https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#workspaceEdit ), but the support for 'documentChanges' is not implemented yet in the QtC LSP client.