fix: update plugin docs with abortSignal support (#790)

# PR Checklist
- [ ] Have you checked if it works normally in all models? *Ignore this
if it doesn't use models.*
- [ ] Have you checked if it works normally in all web, local, and node
hosted versions? If it doesn't, have you blocked it in those versions?
- [ ] Have you added type definitions?

# Description
This PR introduces following:
- Add setArg function to plugin docs
- Add abortSignal parameter to addProvider function

src/ts/process/request.ts

@@ -1690,7 +1690,7 @@ async function requestPlugin(arg:RequestDataArgumentExtended):Promise<requestDat
             max_tokens: maxTokens,
         }, [
             'frequency_penalty','min_p','presence_penalty','repetition_penalty','top_k','top_p','temperature'
-        ], {}, arg.mode) as any)) : await pluginProcess({
+        ], {}, arg.mode) as any, arg.abortSignal)) : await pluginProcess({
             bias: bias,
             prompt_chat: formated,
             temperature: (db.temperature / 100),