[Rust] Do not derive Debug on packed struct

See [#46043](rust-lang/rust#46043).

Author: Vadim Platonov

sbe-tool/src/main/java/uk/co/real_logic/sbe/generation/rust/RustGenerator.java

@@ -197,7 +197,7 @@ private static void generateSingleBitSet(final List<Token> tokens, final OutputM
         final String setType = formatTypeName(beginToken.applicableTypeName());
         try (Writer writer = outputManager.createOutput(setType + " bit set"))
         {
-            writer.append("#[derive(Debug,Default)]\n");
+            writer.append("#[derive(Default)]\n");
             writer.append("#[repr(C,packed)]\n");
             final String rustPrimitiveType = rustTypeName(beginToken.encoding().primitiveType());
             writer.append(format("pub struct %s(pub %s);\n", setType, rustPrimitiveType));