feat: Add new module to scope avs related "utility" stuff

Use this to share helpers or other extensions to the
original avs API across modules.

Start with including error codes to readable strings
to improve velocity on AVS API error analysis.

src/main/avs-util/Module.mk

@@ -0,0 +1,6 @@
+libs            += avs-util
+
+libs_avs-util     := \
+
+src_avs-util     := \
+    error.c \