[FEATURE] Support PEP 440 direct references to source packages

[madpah]

As documented https://pip.pypa.io/en/stable/cli/pip_install/#examples (point 9), it is possible to define requirements as follows, which this library cannot parse at present:

python -m pip install SomeProject@http://my.package.repo/SomeProject-1.2.3-py33-none-any.whl
python -m pip install "SomeProject @ http://my.package.repo/SomeProject-1.2.3-py33-none-any.whl"
python -m pip install SomeProject@http://my.package.repo/1.2.3.tar.gz

Validating the above with pip 22.0.4 as follows:

> python -m pip install "Jake @ https://files.pythonhosted.org/packages/d1/aa/e1be071cde813cafca797678c728b9fa686aa7d72c3e10c512ac7a5599d2/jake-2.0.0-py3-none-any.whl"
...

> pip freeze 
...
jake @ https://files.pythonhosted.org/packages/d1/aa/e1be071cde813cafca797678c728b9fa686aa7d72c3e10c512ac7a5599d2/jake-2.0.0-py3-none-any.whl
...

This feature should parse the above example to a Requirement as follows:

{
   "line": "jake @ https://files.pythonhosted.org/packages/d1/aa/e1be071cde813cafca797678c728b9fa686aa7d72c3e10c512ac7a5599d2/jake-2.0.0-py3-none-any.whl",
   "editable": false,
   "local_file": false,
   "specifier": false,
   "vcs": null,
   "revision": null,
   "name": "jake",
   "uri": "https://files.pythonhosted.org/packages/d1/aa/e1be071cde813cafca797678c728b9fa686aa7d72c3e10c512ac7a5599d2/jake-2.0.0-py3-none-any.whl",
   "subdirectory": null,
   "path": null,
   "hash_name": null,
   "hash": null,
   "extras": [],
   "specs": []
}

[FlorentJeannot]

Hello @madpah

I'm very interested by this fix and some others, and I was wondering if this is going to support the extra requirements out of the box?

For example, you can try this:

pip install 'uvicorn[standard] @ git+https://github.com/encode/uvicorn.git'

You'll see that the command works and installs everything that is specified as extra requirements.
https://github.com/encode/uvicorn/blob/0.17.6/setup.py#L54

Also if you need help I can try to work on some issues, but I am not very fluent in regex (just the basics) and it looks like your tool is using them extensively.

EDIT: Sorry I see this one is for source packages only, I should have written my question in issue #74 instead. Although, I think my question still applies to both issues.