feat: Intents bitfield (#3844)

* feat: Intents bitfield

* suggestion: properly construct Intents.ALL

* fix: actually document the ws option

* suggestion: remove disabledEvents in favor of intents

* suggestion: remove obsolete check, validate falsy values

Co-Authored-By: SpaceEEC <spaceeec@yahoo.com>

* fix: GUILD_BANS flag

* fix: exception for intents check in ws options

Co-Authored-By: SpaceEEC <spaceeec@yahoo.com>

* docs: IntentsResolvable

Co-Authored-By: SpaceEEC <spaceeec@yahoo.com>

* Update Client.js

Co-authored-by: SpaceEEC <spaceeec@yahoo.com>
Co-authored-by: Crawl <icrawltogo@gmail.com>

src/index.js

@@ -22,6 +22,7 @@ module.exports = {
   DiscordAPIError: require('./rest/DiscordAPIError'),
   HTTPError: require('./rest/HTTPError'),
   MessageFlags: require('./util/MessageFlags'),
+  Intents: require('./util/Intents'),
   Permissions: require('./util/Permissions'),
   Speaking: require('./util/Speaking'),
   Snowflake: require('./util/Snowflake'),