Add "Prompt for Rename" option to "Explorer: Incremental Naming"#247870

<!-- ⚠️⚠️ Do Not Delete This! feature_request_template ⚠️⚠️ --> <!-- Please read our Rules of Conduct: https://opensource.microsoft.com/codeofconduct/ --> <!-- Please search existing issues to avoid creating duplicates. --> <!-- Describe the feature you'd like. --> Add a "Prompt for Rename" option to "Explorer: Incremental Naming". When pasting a file with a conflicting name the user should be prompted to enter a non-conflicting name. There are a couple of options for implementing this that I thought of, but am not sure which is preferable. The first is to do something broadly equivalent to the user doing the following: 1. Paste the file with Explorer: Incremental Naming set to "Simple" 2. Begin renaming the file (such as by pressing f2 with the file selected 3. Start editing the filename in the file list to the original file name so that it is colored red indicating a conflict The user is then left in the process of renaming the file and can provide a valid name starting from the original name. The second option is that the user is prompted to enter a name in the in the standard user input location where you can enter commands / search for files. Populate the field with the original name. If the original name is confirmed then overwrite the destination file. The first method has the advantage that the prompt for the file name happens where the user is already looking and is the usual place for renaming files. The second has the advantage that it allows the user to overwrite files, though the inability to overwrite files could be seen as an advantage of the first method. My preference would be for the first method as it fits better with a common task of making slightly tweaked files - e.g. given `config.yaml` I want to make `config_bar.yaml` with changed values inside. I don't know if that conflicts with any UI consistency guidelines for vscode though.