Import Lingua Franca integration test

- Only federated tests with C target are imported.

.github/workflows/rust.yml

@@ -25,4 +25,16 @@ jobs:
       - uses: actions/checkout@v3
       - name: Unit tests
         run: cd rust/rti; cargo test
-
+
+  fetch-lf:
+    uses: lf-lang/lingua-franca/.github/workflows/extract-ref.yml@master
+    with:
+      file: 'lingua-franca-ref.txt'
+
+  lf-default:
+    needs: fetch-lf
+    uses: chanijjani/lingua-franca/.github/workflows/c-tests-with-rust-rti.yml@integration_tests_with_rust_rti
+    with:
+      runtime-ref: ${{ github.ref }}
+      compiler-ref: ${{ needs.fetch-lf.outputs.ref }}
+