Expand benchmarks to different dep graph shapes.

[davidmorgan]

Also add: support for setting the benchmark size, support for ignoring failures, and support for the --use-experimental-resolver flag.

The current implementation stack overflows for sizes >500 libraries, because the import walking uses a recursive algorithm; I'll fix that in the next PR. That's what the "ignore failures" flag is for :) as it allows getting output.

> dart run _benchmark --generator=json_serializable --build-repo-path=$PWD/.. benchmark --ignore-failures
json_serializable
shape,libraries,clean/ms,no changes/ms,incremental/ms
loop,1,21831,3934,5459
loop,100,23374,4075,7510
loop,250,29461,4285,13947
loop,500,44638,5220,32247
loop,750,X,X,X
loop,1000,X,X,X
forwards,1,22090,3879,5176
forwards,100,23912,4173,7610
forwards,250,26549,4230,10493
forwards,500,36675,4727,22571
forwards,750,X,X,X
forwards,1000,X,X,X
backwards,1,22396,4115,5306
backwards,100,23500,4204,7321
backwards,250,27423,4164,11095
backwards,500,38999,4895,21654
backwards,750,X,X,X
backwards,1000,X,X,X

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Package publishing

Package	Version	Status	Publish tag (post-merge)
package:build	2.4.2	already published at pub.dev
package:build_config	1.1.2	already published at pub.dev
package:build_daemon	4.0.4	ready to publish	build_daemon-v4.0.4
package:build_modules	5.0.11	already published at pub.dev
package:build_resolvers	2.4.4-wip	WIP (no publish necessary)
package:build_runner	2.4.15-wip	WIP (no publish necessary)
package:build_runner_core	8.0.1-dev	ready to publish	build_runner_core-v8.0.1-dev
package:build_test	2.2.4-wip	WIP (no publish necessary)
package:build_web_compilers	4.1.1	already published at pub.dev
package:scratch_space	1.0.3-wip	WIP (no publish necessary)

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PR Health

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