Add callgraph generation to callgrind based benchmarks (#1465)

This functionality adds a new callgraph generated from the callgrind run
to the `slang` and `cmp` benchmarks. It generates 2 new files:
- `callgrind.<test name>.test.out.callgraph.dot`, the graphviz
representation of the callgraph
- `callgrind.<test name>.test.out.callgraph.svg`, the rendered version

It adds a dependency to `graphviz` and `gprof2dot`.

I run both benchmarks to test it out:
- https://github.com/NomicFoundation/slang/actions/runs/19263493239
- https://github.com/NomicFoundation/slang/actions/runs/19260165720

Author: teofr

.github/workflows/benchmark_cargo_cmp.yml

@@ -39,8 +39,8 @@ jobs:
       - name: "Restore Cache"
         uses: "./.github/actions/cache/restore"
 
-      - name: "infra setup cargo"
-        run: "./scripts/bin/infra setup cargo"
+      - name: "infra setup cargo pipenv"
+        run: "./scripts/bin/infra setup cargo pipenv"
 
       - name: "Set bencher project"
 

.github/workflows/benchmark_cargo_slang.yml

@@ -39,8 +39,8 @@ jobs:
       - name: "Restore Cache"
         uses: "./.github/actions/cache/restore"
 
-      - name: "infra setup cargo"
-        run: "./scripts/bin/infra setup cargo"
+      - name: "infra setup cargo pipenv"
+        run: "./scripts/bin/infra setup cargo pipenv"
 
       - name: "Set bencher project"
 

Pipfile

@@ -17,3 +17,6 @@ mkdocs-pymdownx-material-extras = "==2.8"
 
 # Used by 'infra lint':
 yamllint = "==1.37.0"
+
+# Used by 'infra perf cargo':
+gprof2dot = "==2025.4.14"