Allow to specify a configuration folder location instead of the default ~/.sfdx or %USERPROFILE%\.sfdx

[mokchend]

This repository only supports the Salesforce CLI Core libraries if you have a feature request that is not related to the Core Libraries but instead to the Salesforce CLI or the force commands please submit your issue to the forcedotcome/cli repo not this one.

Is your feature request related to a problem? Please describe.
I'm always frustrated when once I have setup my sfdx aliases, and switch my OS: in docker, in WSL2, in VM ... I lost all conf DX config & alias as i'm not able to specify my own (shared) .sfdx directory amongs differents OS.
Please provide a parameter (defined as optionnal) to specify our own .sfdx directory location.

Describe the solution you'd like
Require the ability to specify a configuration folder that handle the DX (hidden) folder, by default on your user home directory called .sfdx

On Mac OS and Linux, you can find your DX config folder in ~/.sfdx
On Windows, you can use %USERPROFILE%.sfdx

Describe alternatives you've considered
This option is usefull when you want to share your SFDX config folder betwen multiple OS, docker machine or WSL2

Additional context
N/A

[Exordian]

Please also move from ~/.sfdx to the XDG spec, a library for that would be [1]. This will also make the config directory configurable.

[1] https://github.com/folder/xdg

[R0Wi]

If we would for example introduce a new environment variable SFDX_DIR (or the newer SF_DIR), one could allow the end user to overwrite the global sfdx/sf state folders by adjusting these lines to something like:

  public static get SFDX_DIR(): string {
    const baseDir = env.getString('SFDX_DIR', os.homedir());
    return path.join(baseDir, Global.SFDX_STATE_FOLDER);
  }

@WillieRuemmele is there any interest in incorporating such a feature?