feat: export config in opts

[ShuP1]

Allows to get additional fields from config like branch.

Currently you need to yaml.parse the config file manually to get those.

With config:

servers:
  main:
    host: screeps.com
    secure: true
    token: xxxx
    branch: v2

const api = await ScreepsAPI.fromConfig()
console.log(api.opts.branch)