feat(cli): group by license in licenses list (#5074)

[iansu]

Summary

Group packages by license when running yarn license list as requested in #5074.

Test plan

Run yarn license list in an existing package and observe that packages are grouped by license.

[buildsize]

This change will increase the build size from 10.39 MB to 10.39 MB, an increase of 1.01 KB (0%)

File name	Previous Size	New Size	Change
yarn-[version].noarch.rpm	900.2 KB	900.22 KB	21 bytes (0%)
yarn-[version].js	3.91 MB	3.92 MB	289 bytes (0%)
yarn-legacy-[version].js	4.06 MB	4.06 MB	610 bytes (0%)
yarn-v[version].tar.gz	905.32 KB	905.36 KB	39 bytes (0%)
yarn_[version]all.deb	669.15 KB	669.22 KB	72 bytes (0%)

[rally25rs]

Previous output was of the form:

├─ abab@1.0.3
│  ├─ License: ISC
│  └─ URL: git+https://github.com/jsdom/abab.git
├─ abbrev@1.1.0
│  ├─ License: ISC
│  └─ URL: http://github.com/isaacs/abbrev-js
├─ acorn-dynamic-import@2.0.2
│  ├─ License: MIT
│  └─ URL: https://github.com/kesne/acorn-dynamic-import

New output with this PR is of the form:

├─ BSD
│  ├─ dnscache@1.0.1
│  │  ├─ URL: http://github.com/yahoo/dnscache.git
│  │  └─ VendorName: Vinit Sacheti
│  ├─ glob@3.1.21
│  │  ├─ URL: git://github.com/isaacs/node-glob.git
│  │  ├─ VendorName: Isaac Z. Schlueter
│  │  └─ VendorUrl: http://blog.izs.me/
│  ├─ graceful-fs@1.2.3
│  │  ├─ URL: git://github.com/isaacs/node-graceful-fs.git
│  │  ├─ VendorName: Isaac Z. Schlueter
│  │  └─ VendorUrl: http://blog.izs.me
│  ├─ regenerator-transform@0.10.1
│  │  ├─ URL: https://github.com/facebook/regenerator/tree/master/packages/regenerator-transform
│  │  └─ VendorName: Ben Newman
│  └─ unique-stream@1.0.0
│     ├─ URL: https://github.com/eugeneware/unique-stream
│     └─ VendorName: Eugene Ware
├─ BSD-2-Clause
│  ├─ cmd-shim@2.0.2
│  │  └─ URL: https://github.com/ForbesLindesay/cmd-shim.git
│  ├─ damerau-levenshtein@1.0.4
│  │  ├─ URL: https://github.com/lzrski/node-damerau-levenshtein.git
│  │  └─ VendorName: The Spanish Inquisition

@Haroenv does this fit your intent behind #5074 ? I also added you as a requested reviewer since it was your feature request 😉

[Haroenv]

This definitely makes it more easy to grasp! I was originally more thinking of a simple list of the licenses, but this is definitely a great UI too

[Haroenv]

This is a breaking change right?

[iansu]

It changes the output so if some other tool was parsing that then this would break it. I believe the JSON output is unchanged though, which is hopefully what you'd be using in that case.

[arcanis]

Thanks! This is a great idea!