feat: remove jsonrpc client in favor of grpc client

.github/workflows/tests.yml

@@ -131,6 +131,8 @@ jobs:
         run: cargo install sqlx-cli --no-default-features --features postgres
       - name: Run the test sqlx migrations
         run: cargo sqlx migrate run
+      - name: Start mock server
+        run: cargo run --bin mock_tap_aggregator_server_runner &
       - name: Run tests and generate coverage report
         run: cargo llvm-cov test --all-features --workspace --lcov --output-path lcov.info
       - name: Upload coverage to Coveralls