Updating V1 to V2.6.0 - Decode issues

Hey HashiPeople,

I'm currently using V1 for decoding *.tf files to JSON using hcl.Decode as such:
```
func parseHcl(terraformFile string) (interface{}, error) {
var decodedFile interface{}
decodeError := hcl.Decode(&decodedFile, terraformFile)

return decodedFile, decodeError
}
```
I want to update to V2.6.0 mainly to support version 0.12 and greater but I can't seem to find the parallel to that generic hcl.Decode
I tried figuring out hcldec and hclgo Decode functions, but didn't succeed in understanding the additional arguments.

I'd really appreciate your help with that,
Thanks a lot.

Start by comparing the HCL V1 hcl.Decode usage shown in the issue with the HCL V2.6.0 hcldec and hclgo Decode functions, including their additional arguments. Done means identifying or documenting the supported V2 approach for decoding .tf files to JSON.

Written by the indexing model from the issue text.