[FEATURE] Support installation from git repositories hosted over HTTP only

[arika0093]

Is your feature request related to a problem? Please describe.
Currently, installation from git sources hosted on private servers only supports HTTPS and SSH, excluding HTTP. This becomes an issue especially when the git hosting service within a corporate environment is only available over HTTP.
Specifically, the following error occurs:

$ apm --version
Agent Package Manager (APM) CLI version 0.8.11

$ apm install http://git.server.internal.com/user/repo
[*] Validating 1 package...
[x] http://git.server.internal.com/user/repo -- not accessible or doesn't exist -- run with --verbose for auth details
All packages failed validation. Nothing to install.

Describe the solution you'd like
Support for the HTTP protocol. I would like APM to support installation over HTTP, just as the regular git clone command does.
The installation command would ideally look like this:

$ apm install http://git.server.internal.com/user/repo

The apm.yml file would look something like this:

name: sample
version: 1.0.0
description: Sample package
author: Sample Author
dependencies:
    - microsoft/apm-sample-package
    # The simplest way to specify
    - http://git.server.internal.com/user/repo
    # Alternatively, it could be in the following format.
    - repo_url: user/repo
      host: git.server.internal.com
      protocol: http
      # If explicit specification is required
      allow_insecure: true  # Flag to allow HTTP

Describe alternatives you've considered
The current workaround is to first clone the HTTP-hosted git repository locally and then install from the local path using APM. However, this completely undermines the benefits of using APM.

Additional context
None.

[arika0093]

Referring to the apm manifest schema, it is currently defined to accept http://. Therefore, it may be more appropriate to consider this as a bug fix rather than a feature request.