Refactor: Added Typings, updated docs

[Moebits]

What: I added typings for Typescript users, every function now returns either CamelCased types or snake_cased types depending on the value of camelcaseKeys. Example:

//const pixiv = new PixivAppApi(process.env.NAME, process.env.PASSWORD, {camelcaseKeys: true})
interface PixivClient = {
  accessToken: string
  expiresIn: number
  tokenType: string
  scope: string
  refreshToken: string
  user: PixivClientUser
  deviceToken: string
}

//const pixiv = new PixivAppApi(process.env.NAME, process.env.PASSWORD, {camelcaseKeys: false})
interface Pixiv_Client = {
  access_token: string
  expires_in: number
  token_type: string
  scope: string
  refresh_token: string
  user: Pixiv_Client_User
  device_token: string
}

Other changes:
-Removed almost every any type
-Changed all .then() chains to async/await
-Added the new endpoint /v1/ugoira/metadata
-Updated the docs

Broken endpoints:
-Some endpoints no longer work, I got this error while testing them: Specified end-point doesn't exist. I added comments to these functions, most notably they involve adding/deleting follows or bookmarks.
-I don't know what this function does nextQuery() since it always returns undefined. However, I left it as is.

Why: Using this library is a pain for Typescript users due to the lack of type definitions. Especially since it's written with Typescript, it should return types for all of the functions.

How: I added type definitions in these two files: PixivTypes.ts and Pixiv_Types.ts and I imported them in index.ts.

Checklist:

• Documentation
• Tests
• Ready to be merged I would still double check the typings, since there are a lot and I could have missed some/incorrectly typed some.
• Added myself to contributors table

[akameco]

remove package-lock.json. use yarn.

[akameco]

👍

[akameco]

Keep "singleQuote": true

[akameco]

Do not change .prettierrc

[akameco]

Cool 💯

[akameco]

@Tenpi Thank you 👍