icon: add icon for HCL files

[bmalehorn]

I work in packer files on a regular basis, and it bothered me that these don't have a file icon. Add a file icon, downloaded from https://www.hashicorp.com/brand:

before	after (dark)	after (light)

[hashicorp-cla]

All committers have signed the CLA.

[jpogran]

Thanks for the contribution @bmalehorn! We purposely didn't include an icon until we got a better idea of which products people would use with this extension.

It's also not that common for extensions to provide icons, that's usually theme/icon packs area. This allows users to pick and choose which icons according to their desire.

That being said, this extension is meant for any product that uses the HCL extension, so I like that your choice uses the company logo. Having a Packer specific icon for Packer files would make sense, but we did not want to commit to any one direction at that time.

We'll review this shortly and see if we can merge this as is and change the icons later without much to do, or that we have to make the decision one way or another right now.

[jpogran]

Apologies on the delay @bmalehorn , we merged this in and it it will be in the next release!