Add more fuzz targets

wasm/src/backend/mod.rs

@@ -1,4 +1,4 @@
-mod ast;
+pub mod ast;
 pub mod edition;
 pub mod translator;
 mod visitor;

wasm/src/backend/translator/mod.rs

@@ -1,3 +1,3 @@
 pub mod arity;
 pub mod data;
-mod writer;
+pub mod writer;