test: add test_mod_dep build targets and update test_mod with metadata

test/test_mod_dep.c

@@ -0,0 +1,19 @@
+#include <stdio.h>
+
+typedef struct {
+	char id[64];
+	char version[32];
+} dep_t;
+
+int stk_mod_init(void)
+{
+	printf("test_mod_dep initialized!\n");
+	return 0;
+}
+
+void stk_mod_shutdown(void) { printf("test_mod_dep shut down.\n"); }
+
+const char *stk_mod_name(void) { return "Dependent Test Module"; }
+const char *stk_mod_version(void) { return "1.0.0"; }
+
+dep_t stk_mod_deps[] = {{"test_mod", ">=1.0.0"}, {"", ""}};