Add performance baseline

[klauspost]

Disables stdlib tests.

[orijbot]

Visit https://dashboard.github.orijtech.com?back=0&pr=434&remote=false&repo=klauspost%2Fcompress to see benchmark details.

[odeke-em]

@klauspost sorry for the confusion and thank you for using bencher! So after you merge this master, we'll finally have some baseline comparison values and then subsequent PRs will use that baseline :-) cc @cuonglm

[klauspost]

@odeke-em Yeah, there are literally hundreds of benchmarks in this package, so your system will get quite a workout.

Maybe I should make the non-important benchmarks be ignored by -test.short, so I can filter them a bit.

[odeke-em]

Thanks for the notice @klauspost! Good point about using if testing.Short() As for the number of tests, it might take like 30+ minutes but the tests are running for example https://dashboard.github.orijtech.com/benchmark/f47cd13a3f1b4c5da331880af8f63adc

[odeke-em]

@klauspost, now that you have the baseline data available, things should run smoothly. I also created my own fork of this repo and firstly started with a change in March 2020 orijtech@badde52 and from that used the current code on your master branch and this was the interesting result https://dashboard.github.orijtech.com/benchmark/ddfc52a0d5a743cf8b0f3785fb5e1ef0

Lots of improvements in pretty much all the benchmarks. However, some like RandomEncode, GzipL6, Encoder*, Deflate/, Decompress have regressed quite a lot since that commit in 2020

cc also @kirbyquerby