feat(string): started on a string type

[callumgran]

Started creating a string type base on the following struct:

struct string_t {
    char *data;
    size_t length;
    size_t capacity;
};

Currently working on creating fast functions for string operations.

[LytixDev]

Should we go crazy and add native unicode support for our strings?

https://github.com/SerenityOS/serenity/blob/master/AK/String.h

[LytixDev]

Maybe we should consider to have two string types. Might be super duper janky. Having an immutable string is very useful. Yes -- for an immutable string you could just use the good ol' char *, but it would be nice to be able to use the same string library.

struct string_t {
    char *data;
    size_t length;
};

struct string_mut_t {
    struct string_t str;
    size_t capacity;
};

[callumgran]

I agree to both statements above

[callumgran]

Bro why u change to *=2? Strings don't usually get that much bigger so it doesn't really make sense to have possibly 2x the amount of allocated memory compared to having a mear 32 bytes extra.