Break up library into macros and map nested libraries for shared dependency with constant map macro.

Cargo.toml

@@ -6,4 +6,8 @@ edition = "2024"
 [features]
 bighash = []
 assertions = []
-messages = []
+messages = []
+
+[dependencies]
+macros = { path = "macros" }
+map = { path = "map" }