feat: replace structure constructors with static `create` method

[DanieliusDev]

Package

guilded.ts

Description

Make structure constructors private and add a static create method that in most cases will be async. This will allow us to use async code while creating a new structure instance. In this new static method it will fetch all the needed structures such as the channel of a message.

Solution

Make structure constructors private and add a static create method which uses the constructor.

Alternative Solutions

No response