Implement memory context realloc function

mem/include/ctx/mem_ctx.h

@@ -17,6 +17,9 @@ typedef enum {
 void wapp_mem_ctx_init(u64 main_buf_capacity, u64 temp_buf_capacity);
 void *wapp_mem_ctx_alloc(CTXDestBuffer buffer, u64 size);
 void *wapp_mem_ctx_alloc_aligned(CTXDestBuffer buffer, u64 size, u64 alignment);
+void *wapp_mem_ctx_realloc(CTXDestBuffer buffer, void *ptr, u64 size);
+void *wapp_mem_ctx_realloc_aligned(CTXDestBuffer buffer, void *ptr, u64 size,
+                                   u64 alignment);
 void wapp_mem_ctx_clear(CTXDestBuffer buffer);
 void wapp_mem_ctx_free(void);