Add a console with a reboot command

Couldn't just call the component "console" as that conflicted with the
ESP-IDF component, so opted for "console-wrapper".

components/console_wrapper/console.h

@@ -0,0 +1,25 @@
+/*
+ * SPDX-License-Identifier: AGPL-3.0-only
+ * Copyright (c) Camden Dixie O'Brien
+ */
+
+#ifndef CONSOLE_H
+#define CONSOLE_H
+
+typedef int (*CommandFunc)(int argc, char **argv);
+
+/**
+ * Initialize and start the console.
+ */
+void console_init(void);
+
+/**
+ * Register a console command.
+ *
+ * The name, help and hint should all be null-terminated strings. Hint
+ * should list possible arguments.
+ */
+void console_register(
+	const char *name, const char *help, const char *hint, CommandFunc func);
+
+#endif