custom worldspider ops

[socketteer]

right now there are only three GPT operations: generate continuation, generate infill, and score probability of text.
we should add some more, like summarization.
rather than specific prompts for operations like summarization, I'd like to make a system for configuring custom operations the user can easily add
I think this should be a json file that contains information about the command a prompt template with variables like $prefix, $suffix, $selected_text
The user should be able to create new operations specified by these config files, and bind them to hotkeys. I am not sure how to do this last part (creating extension commands on the fly).