Change dependent types to be included as peerDependencies

[glentakahashi]

Add all of the typesDependencies to be added as peerDependencies instead of dependencies to fix transitive dependency issues such as in #366

Tested locally and got expected results

[msftclas]

This seems like a small (but important) contribution, so no Contribution License Agreement is required at this point. We will now review your pull request.
Thanks,
Microsoft Pull Request Bot

[henryptung]

Paging @glentakahashi

[RyanCavanaugh]

We can't do this. Editors (VS, VS Code, maybe others) run e.g. npm install @types/leftpad and expect that they will get a "working" version of the leftpad types package as a result. NPM no longer installs peer dependencies automatically, so this would break editors (as well as user expectation that you can npm install some types package without further intervention).

[glentakahashi]

Hm okay I took a second reading of peerDependencies and now better understand what they're trying to accomplish and why it won't work. Will close out for now.

@RyanCavanaugh as a sidenote though, do you have any opinions/ideas on how to solve yarnpkg/yarn#3951 and #366 then?

The recommendation in the yarn issue says to use peerDependencies which conflicts the advice above.