Added functions to create and load process contexts

include/context.h

@@ -0,0 +1,8 @@
+#pragma once
+
+#include "pageallocator.h"
+#include "process.h"
+
+void *initialize_context(void *task_entry, struct page_stack_t *page_stack);
+
+void load_context(struct process_state_t *context) __attribute__((noreturn));