Create standard benchmarks

[MatthieuDartiailh]

With bytecode specialization coming to 3.11 to load attribute and 3.12 regarding properties it would be nice to have a set of benchmarks to check atom performance and investigate if we need to take specific actions to preserve the performances with upcoming version. We could also benchmark memory use which is also expected to go down in 3.11 thanks to lazy creation of some structures.