Aggregate benchmark results

Now we write our benchmark results to json files, the next step is to aggregate this information into a master document during one of the later CI steps.

dvmp/benchmark.json

+{
+  "name": "DVMP",
+  "title": "DVMP Benchmark",
+  "description": "Benchmark for exclusive J/psi and Upsilon physics",
+  "target": "0.8"
+}