Implement Better Discord Errors

[quinchs]

Summary

This PR implements parsing of the JSON error messages received by discord, it also deprecates ApplicationCommandException as this is no longer needed.

This PR makes major changes to the HttpException including:

• Changing Error to Errors and changing the type of it to IReadOnlyCollection<DiscordJsonError>.
• Changing the type of DiscordCode from int? to DiscordErrorCode

The DiscordErrorCode enum is kept up to date with the Official docs, it contains all the error codes and is parsed thru the request bucket.

The DiscordJsonError class contains a path of the json as well as a string message and code that tells the executer what went wrong with the request.

[SylveonDeko]

Fun