Added the command of overwriting interface files

Added the command of overwriting interface files

I need to update the .resi interface file from time to time while using the plugin. However, in each operation, I had to delete the old file before using the plug-in command to create a new .resi interface file, which was really uncomfortable. Therefore, I have the following improvement requirements.

1. When a .resi file exists, the command can override the contents of the original file.
2. If the file does not exist, the .resi file is created, and the behavior is the same as that of creating an interface file.

In terms of implementation

I looked at the source code, and adding a command doesn't add much complexity.

Other things

I am very sorry that I have not learned the TS code, so I cannot submit the relevant code implementation. Thank you very much for your earnest and dedication.

Start with client/src/commands/create_interface.ts, the command source named in the issue. Trace how it handles an existing .resi file and a missing one, then verify that existing files are overwritten while missing files retain the current creation behavior.