Update dependencies and replace `request` package

[strmer15]

This fixes https://github.com/howdyai/botkit/issues/2238

• Updates a lot of dependencies, since I couldn't actually install or build anything until I did a lot of these

  • Latest eslint and plugins, so that there weren't peer dependency errors
    • Updated the config files, notably switched @typescript-eslint/ban-ts-ignore to @typescript-eslint/ban-ts-comment
    • eslint-plugin-node has been replaced by eslint-plugin-n
  • Latest typescript and tsdoc, tsdoc 0.22 was giving peer dependency errors about old typescript
    • Fixed the build-docs command, seems like it may have been broken for a while - incorrect options, missing tsconfig
    • Removed typedoc-plugin-external-module-name since it's no longer maintained and doesn't work with newer tsdoc versions
  • Regenerated package-lock.json files, some of them were deleted since they're no longer used
  • Updated to latest lerna and updated the readme

• Replaced request with cross-fetch in a few different places

  • https://github.com/lquixada/cross-fetch
  • The trickiest part of this is handling the errors and responses - in each case, I'm checking response.ok (for a 2xx response status) and then throwing an Error if it doesn't match. Then, I'm handling the response as plain text or as JSON if it parses correctly.