Add support for Yarn lifecycle scripts

[handerss-spotfire]

Using Yarn, karma cannot be added as a dependency resolved from GitHub due to package.json lacking a prepack script. When Yarn clones a package from github it runs npm install and npm pack, but since karma needs to be built before being packed the resulting package will not function.

See:
https://yarnpkg.com/advanced/lifecycle-scripts
#3530 (issue where this is a problem)

[devoto13]

I believe this has been fixed by #3524. Are you trying to install the latest version from GitHub? Maybe your branch/version does not include this change?

UPD Yeah, I think it is a matter of rebasing #3531 to get it working. Or maybe you can submit a change requested in that PR, so we can merge it?

[handerss-spotfire]

Did a quick test and it seems that #3524 does indeed fix this issue. I linked the wrong related issue, but #3530 is the reason for wanting to resolve from github (meant to link yarnpkg/berry#1515). Thanks!