refactor!: welp, a lot of stuff

- Use the OS temp folder to cache the player, closes #57.
- Added support for editing channel name, closes #40.
- Added support for editing channel description.
- Added support for retrieving basic channel analytics, closes #54.
- Moved `Innertube#getAccountInfo()` to `Innertube#account`, and renamed it to `getInfo()`.
- `getInfo()` is now able to return email, channel id, etc.
- Improved jsdoc.

lib/core/OAuth.js

@@ -4,11 +4,8 @@ const Axios = require('axios');
 const Constants = require('../utils/Constants');
 const Uuid = require('uuid');
 
+/** @namespace */
 class OAuth {
-  #scope = Constants.OAUTH.SCOPE;
-  #model_name = Constants.OAUTH.MODEL_NAME;
-  #grant_type = Constants.OAUTH.GRANT_TYPE;
-  
   #oauth_code_url = `${Constants.URLS.YT_BASE}/o/oauth2/device/code`;
   #oauth_token_url = `${Constants.URLS.YT_BASE}/o/oauth2/token`;
   #oauth_revoke_url = `${Constants.URLS.YT_BASE}/o/oauth2/revoke`;
@@ -17,6 +14,10 @@ class OAuth {
   #polling_interval = 5;
   #ev = null;
   
+  /**
+   * @param {EventEmitter} ev
+   * @constructor
+   */
   constructor(ev) {
     this.#ev = ev;
   }
@@ -46,9 +47,9 @@ class OAuth {
 
     const data = {
       client_id: this.client_id,
-      scope: this.#scope,
+      scope: Constants.OAUTH.SCOPE,
       device_id: Uuid.v4(),
-      model_name: this.#model_name
+      model_name: Constants.OAUTH.MODEL_NAME
     };
 
     const response = await Axios.post(this.#oauth_code_url, JSON.stringify(data), Constants.OAUTH.HEADERS).catch((error) => error);
@@ -77,7 +78,7 @@ class OAuth {
       client_id: this.client_id,
       client_secret: this.client_secret,
       code: device_code,
-      grant_type: this.#grant_type
+      grant_type: Constants.OAUTH.GRANT_TYPE
     };
 
     setTimeout(async () => {
@@ -204,16 +205,24 @@ class OAuth {
     return client_identity.groups;
   }
   
+  /**
+   * Returns the access token.
+   * @returns {string}
+   */
   getAccessToken() {
     return this.#auth_info.access_token;
   }
   
+  /**
+   * Returns the refresh token.
+   * @returns {string}
+   */
   getRefreshToken() {
     return this.#auth_info.refresh_token;
   }
   
   /**
-   * Checks if the auth info is valid.
+   * Checks if the auth info format is valid.
    * @returns {boolean} true | false
    */
   isValidAuthInfo() {