Add snake case class name transformer

[JohnGurin]

No description provided.

[skovy]

@JohnGurin if you fix the failing build I can look at getting this merged.

[JohnGurin]

Outsmarted myself and forgot to push yarn.lock last time.
Btw, node-sass is far beyond v4.12. Had to switch to Node 12 to make gyp build succeed on yarn install. Though, initially, I removed peerDependencies from package.json and installed last node-sass manually. And first request passed all checks, but then I decided to tide up some commits and got to the problem with yarn.lock.

[skovy]

4.12 is the last version that supported node 12, but that and shortly node 14 are/will both be end of life - https://nodejs.org/en/about/releases. we could bump this to the last version that supports node 14 but since it's a peer dependency it should work with any version you have installed matching or greater so I don't see any urgency in bumping that peer dependency since it's controlled by the consumer.

[skovy]

🎉 This PR is included in version 6.4.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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