Update js tests to work with bigint for u64

- Updated js tests to work with bigint for u64 to avoid overflows
- Added one more test for Theta with bigger values

.github/workflows/test.yml

@@ -12,6 +12,10 @@ jobs:
       uses: actions/setup-node@v1
       with:
         node-version: ${{ matrix.node-version }}
+    - name: install c dependencies
+      run: |
+        sudo apt install -y nlohmann-json3-dev
+        sudo apt install -y nasm
     - name: Prepare circom
       run: |
         # once circom binary is published, instead of compiling from source