Change font sizes and add scale option in configuration

A comparison was made of the most used fonts and they were placed according to the system sizes. The ones that are often used were left at the default size and a specific variable was created for it, as is the case with `appMessage`, but we can change anything to a system size. In addition, the option to change the font scale was added, so that if someone wants to enlarge the fonts or reduce them, they have an option. (I don't know if it was the correct session, I thought about putting it under appearance or putting it under accessibility). Added an option to set fonts as rounded (many people like it). Changes on UI ### Configuration <img width="828" alt="image" src="https://github.com/SwiftcordApp/Swiftcord/assets/3859282/df04e7e3-c1c5-4741-b2ce-232ef286f015"> ### App 0.9x <img width="1210" alt="image" src="https://github.com/SwiftcordApp/Swiftcord/assets/3859282/ae25a0c9-32b7-455e-b576-c0db1f0ad7a3"> ### App 1.2x <img width="1210" alt="image" src="https://github.com/SwiftcordApp/Swiftcord/assets/3859282/fb8c915c-6d85-4d96-a55d-cf630ad64e78"> ### App Default 1.0x <img width="1210" alt="image" src="https://github.com/SwiftcordApp/Swiftcord/assets/3859282/bfe0d196-1d8c-4e78-b908-0f26a2da0f11">