`host_alias` does not exist for ansible-local

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#### Overview of the Issue

The [documentation (here)](https://www.packer.io/docs/provisioners/ansible/ansible-local#host_alias) show the `host_alias`, however in practice the HCL file isn't valid. I think either the documentation is incorrect or the code is as `host_alias` var doesn't seem to exist for `ansible-local` (however golang is pretty unknown to me). I imagine it is supposed to exist, although a workaround is to add an `inventory_group`.

#### Reproduction Steps

Steps to reproduce this issue

### Plugin and Packer version

From `packer version`

Packer = 1.7.3
Ansible plugin = 1.0.0

### Simplified Packer Buildfile

```packer

packer {
required_plugins {
vagrant = {
version = ">= 1.0.0"
source = "github.com/hashicorp/vagrant"
}
}
required_plugins {
ansible = {
version = ">= 1.0.0"
source = "github.com/hashicorp/ansible"
}
}
}

source "vagrant" "my-box" {
communicator = "ssh"
source_path = "geerlingguy/centos8"
provider = "virtualbox"
output_dir = "build"
}

build {
sources = [
"source.vagrant.my-box"]

provisioner "shell" {
inline = [
"sudo yum install epel-release -y",
"sudo yum install ansible -y",
]
}

provisioner "ansible-local" {
host_alias = "my-box"
playbook_file = "./playbook.yml"
galaxy_file = "./requirements.yml"
}
}

```

### Operating system and Environment details

OS, Architecture, and any other information you can provide about the
environment.

- Windows 10
- x86

### Log Fragments and crash.log files

Include appropriate log fragments. If the log is longer than a few dozen lines,
please include the URL to the [gist](https://gist.github.com/) of the log or
use the [Github detailed format](https://gist.github.com/ericclemmons/b146fe5da72ca1f706b2ef72a20ac39d) instead of posting it directly in the issue.

Set the env var `PACKER_LOG=1` for maximum log detail.

Start by reproducing the HCL validation failure in the ansible-local provisioner using the configuration shown, then compare its accepted options with the linked host_alias documentation. Done means either host_alias works for ansible-local with coverage for the behavior, or the documentation accurately describes the supported configuration and workaround.

Written by the indexing model from the issue text.