a proxy setting for plugin

[clipsheep6]

Since some region is blocked by openai, maybe add a proxy config to let all the traffic using a proxy?

[benzntech]

@gencay :
Documentation : https://pptr.dev/api/puppeteer.browsercontextoptions
Reference
the standard puppeteer launch arg '--proxy-server'

the current solution is:
const browser = await puppeteer.launch({ args: [ '--proxy-server=127.0.0.1:9876' ] });

[gencay]

@clipsheep6 @benzntech please update to v2.6 to use proxy server setting. Check out readme for details https://github.com/gencay/vscode-chatgpt#using-proxies