Allow specifying exact list of plugins to load or to blacklist when initializing ComfyUI through code

The only mechanism currently to disable plugins it seems is to append `.disabled` to the folder name. (anyway this is what the plugin manager does and it seems to work) The problem is that when using ComfyUI through code, many plugins end up totally useless! So if I am debugging on my app and launching many times, I will have to sit over and over again through some slow plugin initialization which are all unnecessary for the most part. Of course I can add the disabling suffix, but I also switch back and forth with the node editor a lot so it becomes a lot of work to manually rename a bunch of folders. For now I am considering creating write a quick shell script to rename folders and call it from my ComfyUI launch script, but it feels like quite the hack.