Add wasm size to output (#1386)

### What
Add wasm size to output

### Why
So that it's easy to look at PRs to see how they change the size of the
test vectors when built.

.github/workflows/rust.yml

@@ -113,6 +113,12 @@ jobs:
       run: rm -fr **/test_snapshots
     - name: Build for wasm
       run: cargo-hack hack build --target wasm32-unknown-unknown --profile release
+    - name: Wasm Size
+      run: |
+        cd target/wasm32-unknown-unknown/release/ && \
+          for i in *.wasm ; do \
+            ls -l "$i"; \
+          done
     - if: "!matrix.sys.cdylib-cross-compile-workaround"
       name: Build for native
       run: cargo-hack hack --feature-powerset --exclude-features docs build --target ${{ matrix.sys.target }}