ci(circleci): add benchmark comparisons

[hannahhoward]

Goals

Add Benchmarking to CI in Bitswap!

Implementation

This adds a new job to Bitswap's Travis Config that runs benchmarks across both master and the current branch based on ipfs/kubo#6446 but adopted for Travis instead of CircleCI (various script config changes, etc)

Also, required making a few patches to benchmarks so they aren't failing and also seeded on a similar random seed. These were merged in master so this PR could complete CI w/o failing. (#dontHateMe)

For Discussion

I can't get these to predictably and reliably pass without setting the threshold lower than <5% --- I've got it currently set at <25%, which is a bummer in that it's imprecise but still protects against order of magnitude regressions ala what happened with 0.4.21.

Also, this does mean CI takes somewhat longer, about 6 minutes.

[Stebalien]

The benchmarks look good but I'd like to avoid duplicating the CI scripts. And yeah, 25% sucks but it's CI.

Thanks for putting this together!

[Stebalien]

We don't need this file.

[Stebalien]

We can probably skip all of this logic and just rely on the standard test scripts.

[Kubuxu]

Let's have \n at the ends of scripts. This is standard on unix systems.

[Kubuxu]

shellcheck pointed these out:

In benchmark-to-file.sh line 2:
output="$1"
^----^ SC2034: output appears unused. Verify use (or export if used externally).


In benchmark-to-file.sh line 3:
branch="$2"
^----^ SC2034: branch appears unused. Verify use (or export if used externally).


In diff-benchmarks.sh line 3:
before="$1"
^----^ SC2034: before appears unused. Verify use (or export if used externally).


In diff-benchmarks.sh line 4:
after="$2"
^---^ SC2034: after appears unused. Verify use (or export if used externally).


In run-benchmarks.sh line 6:
	eval $(printf '%q ' "$@")
             ^------------------^ SC2046: Quote this to prevent word splitting.

For more information:
  https://www.shellcheck.net/wiki/SC2034 -- after appears unused. Verify use ...
  https://www.shellcheck.net/wiki/SC2046 -- Quote this to prevent word splitt...

[hannahhoward]

@Stebalien + @Kubuxu incorporated suggestions though I wasn't sure what to do with "The benchmarks look good but I'd like to avoid duplicating the CI scripts." Anyway let me know if I can merge.

[Stebalien]

LGTM! ❤️

The "duplicate code" comment was referring to the code duplicated from https://raw.githubusercontent.com/ipfs/ci-helpers/master/travis-ci/run-standard-tests.sh