feat: Added arena_push and arena_realloc

decided that arena_push will handle everything, will use alloc then push into it,
also, used realloc as a separate function for better handling resize and shit, next
is creating a save function that calculates the size needed for the element
and if it's too fucking much then throw an error. A bit overkill but yeah, i'm like
that all the time, this is suppossed to be a library to support my calculator like
damn but ok.

include/arena.h

@@ -7,13 +7,13 @@
 #include <stdbool.h>
 
 typedef struct {
-    uint8_t *data;
+    uint8_t *buffer;
     size_t size;
     size_t offset;
 } Arena;
 
 typedef enum {
-    ARENA_OK,
+    ARENA_OK = 0,
     ARENA_BAD_ALLOC,
     ARENA_OUT_OF_SPACE,
     ARENA_NULL_ARG,
@@ -24,7 +24,7 @@ typedef struct {
     bool is_valid;
     union {
         ArenaErr err;
-        uint8_t *pointer;
+        uint8_t *address;
     };
 } ArenaPointer;
 
@@ -40,7 +40,7 @@ ArenaResult arena_init(size_t size);
 void arena_destroy(Arena *arena);
 
 ArenaPointer arena_alloc(Arena *arena, size_t size, size_t alignment);
-ArenaErr arena_push(Arena *arena, void *data, size_t size);
+ArenaErr arena_push(Arena *arena, void *data, size_t size, size_t alignment);
 ArenaErr arena_realloc(Arena *arena, size_t new_size);
 
 size_t align_arena_offset(Arena *arena, size_t alignment);