Compile-time pattern parsing

[ChristianPanov]

Since the formatting patterns are always literals, thus are known at compile-time, it will be beneficial to reimplement the pattern parsing to happen at compile-time through metaprogramming

EDIT: It will be impossible to implement compile-time pattern parsing because of the logger's runtime polymorphic nature. Even if constexpr parsing functions are implemented, they will be called from functions that cannot be compile-time, and thus these functions will not be called at compile-time themselves