Initialize benchmark package

[srid]

Add cabal bench package with a dummy benchmark, as base for #9

@TotallyNotChase Feel free to add your benchmarks here. If you are not using criterion feel free to remove it, but it would be nice to be able to generate the benchmark report in JSON (criterion does this automatically for us), so that we can integrate it to CI for a nicer report like IntersectMBO/plutus#3494 (comment) ... edit: actually, it may be a good idea to use criterion here because we get cheap comparison tools (see next paragraph).

@MatthewCroughan nix build '.#pluton:bench:perf' followed by running ./result/bin/perf generates a bench.json as well as bench.csv that can be used to generate the CI report (there is also bench.html for the corresponding HTML view). There is even criterion-compare which seems to do the heavy-lifting here. cf. haskell/criterion#151

[srid]

bench.csv =>

Name,Mean,MeanLB,MeanUB,Stddev,StddevLB,StddevUB
fib/1,5.626615908983465e-9,5.204812201870928e-9,6.264731155976395e-9,1.716652388696088e-9,1.2457188183919467e-9,2.2170916103471158e-9
fib/5,2.6809657559565625e-8,2.645283350629125e-8,2.7510165335409422e-8,1.6655396284576668e-9,1.0559431569056852e-9,2.4737825591278294e-9
fib/9,2.0783884805815688e-7,2.058856748400889e-7,2.1078807548744367e-7,8.241848518035217e-9,5.6001125047839684e-9,1.0920654754077311e-8
fib/11,5.536281632540129e-7,5.48200847684166e-7,5.615283224083176e-7,2.1481856752110492e-8,1.5241171933881577e-8,2.797168473489698e-8