Enhance benchmark output with structured format

Updated the benchmark command to include the `--output-format bencher` flag, enabling more structured and standardized output. This change facilitates easier analysis and integration with tools that support the bencher output format.

.github/workflows/ci.yml

@@ -59,7 +59,7 @@ jobs:
       - name: Start test NTP server
         run: uvx --from git+https://github.com/vpetrigo/ntpserver@master ntpserver > /dev/null &
       - name: Run benchmarking
-        run: cargo bench --bench async --bench sync --features sync | tee output.txt
+        run: cargo bench --bench async --bench sync --features sync -- --output-format bencher | tee output.txt
       - name: Kill NTP server
         run: pgrep -f ntpserver | xargs kill
       - name: Store benchmark result