consume helm 3 go lib instead of shelling out to helm

[evanlouie]

As a: Fabrikate user

I want: Fabrikate to consume the helm 3 go package for fetching and templating helm charts

So that: Fabrikate can have exact (in-code) control of how helm fetch and helm template used. This also fixes the requirement for specific Helm versions installed on the host.

Describe the solution you'd like: Instead of shelling out to the host machines Helm binary, install the Helm 3 package https://github.com/helm/helm and rewrite the install and generate commands to utilize that instead of shelling out.

Describe alternatives you've considered: n/a

Additional context:

[michaelperel]

@evanlouie mind if I take a look at this?

[evanlouie]

@michaelperel Hi Micheal. Sure thing, thanks for the assist :)