feat: add walltime benchmark in addition to simulation (#175)

Author: beckermr

.github/workflows/benchmarks.yaml

@@ -21,6 +21,7 @@ jobs:
       fail-fast: false
       matrix:
         python-version: ["3.12"]
+        codspeed-mode: ["simulation", "walltime"]
 
     steps:
       - uses: actions/checkout@v6
@@ -45,4 +46,4 @@ jobs:
         with:
           token: ${{ secrets.CODSPEED_TOKEN }}
           run: pytest -vvs --codspeed
-          mode: simulation
+          mode: ${{ matrix.codspeed-mode }}