CLI GUI upload for op params with ModelType.BYTES.

CLI GUI dynamically creates a dialog for any operation a user wants to execute. The type of UIComponent used for each parameter depends on the ModelType expected.

In the case of a parameter that expects ModelType.BYTES, it currently just provides a text input box. The user would almost never want to upload bytes from the keyboard. Instead, the user wants to upload bytes from a file.

So, CLI GUI should present a "Browse" button to help the user find the file to be uploaded. When the command is executed CLI GUI just reads the file and stuffs the bytes into the operation.