feat: add support for escaping . in address

[mcwarman]

Fixes #26

provider "registry.terraform.io/hashicorp/aws" {
  version     = "3.38.0"
  constraints = "~> 3.38"
  hashes = [
    "h1:qKEjN/EM56XT46vGY33eoq7nD6JuGqRqFp7tkzTrRM0=",
  ]
}

cat ./tmp/.terraform.lock.hcl |  ./bin/hcledit attribute get 'provider.registry\.terraform\.io/hashicorp/aws.version'
"3.38.0"

[minamijoyo]

Thank you for your contribution! Awesome work 👍

[minamijoyo]

@mcwarman Sorry I couldn't review your patch sooner. I've merged and shipped it in the new release v0.2.10 🚀 Thanks!