Implementing intents default and intents all

[KohnoseLami]

Although sapphire provides similar functionality to discord.py, I would like to see the implementation of "discord.Intents.all()" and "discord.Intents.default()" to simplify the specification of intents.
all specifies all intents, including privileged intents.
The default specifies all intents except the privileged intent.

By implementing default and all, I will be able to prevent things like malfunctions due to wrong intent designations by beginners, and TypeScript problems when making Bots that use all intents with super multifunctionality by advanced people, and it will look pretty, too.

There is a concern that implementing default and all will create security and privacy issues that are somewhat prevented by Discord in the form of privileged intents.
Therefore, by deprecating the message command and intents all in the beginner's documentation, and introducing the slash command and default as recommendations, beginners can avoid leaking information such as messages in the server.

Encourage people to use all only if they know what they are doing, such as intermediate people.
There is no problem because intermediate players can specify all by themselves even if there is no all.

[kyranet]

Discord.js actually used to support this as Intents.ALL, however, it was later removed in discordjs/discord.js#6050