feat(arena.c): Added arena init and added ArenaResult

Want to handle errors with results, even if it meas boilerplate

include/arena.h

@@ -17,6 +17,7 @@ typedef enum {
     ARENA_BAD_ALLOC,
     ARENA_OUT_OF_SPACE,
     ARENA_NULL_ARG,
+    ARENA_INVALID_SIZE,
 } ArenaErr;
 
 typedef struct {
@@ -27,11 +28,19 @@ typedef struct {
     };
 } ArenaPointer;
 
-Arena arena_init(void *buffer, size_t size);
+typedef struct {
+    bool is_valid;
+    union {
+        ArenaErr err;
+        Arena arena;
+    };
+} ArenaResult;
+
+ArenaResult arena_init(void *buffer, size_t size);
 void arena_destroy(Arena *arena);
 
 ArenaPointer arena_alloc(Arena *arena, size_t size, size_t alignment);
-ArenaPointer arena_push(Arena *arena, void *data);
+ArenaErr arena_push(Arena *arena, void *data, size_t size);
 ArenaErr arena_realloc(Arena *arena, size_t new_size);
 
 size_t align_arena_offset(Arena *arena, size_t alignment);