Break out Install-GitHubRelease

[Jaykul]

Since there's no other cross-platform solution, can we make this a module like RequiredModules?

1. Break it out and stick it back together with ModuleBuilder
2. Ship it as a module as well (so I can install it with Install-ModuleFast)
3. Make Install-GitHubRelease handle more inputs:
   • The {user}/{project} because that's how people frequently refer to them
   • The project url https://github.com/[user}/{project}
   • A specific release url https://github.com/[user}/{project}/releases/tag/{version}
4. Provide a tinyurl so we can run it directly like Install-ModuleFast?
   Even better, can we have some sort of combined tool that would call both?
5. Provide a way to pass a list so I can skip some of this:

    # Single-binary dependencies we can install from github
    $Tools = @{
        # A mapping of the tool to the github user and project
        yq = "mikefarah","yq"
        kubeconform = "yannh","kubeconform"
        conftest = "open-policy-agent","conftest"
        flux = "fluxcd","flux2"
    }

    # Search for them
    if ((Get-Command $Tools.Keys -ErrorAction SilentlyContinue -ErrorVariable missing).Count -lt $Tools.Count) {
        # Make sure Install-GitHubRelease is here
        if (!($installer = Get-Command Install-GitHubRelease -ErrorAction Ignore)) {
            Write-Information "Installing Install-GithubRelease"
            # The Script path isn't in the PATH on the build servers, so ...
            $Script = Install-Script Install-GithubRelease -Force -PassThru
            $installer = Get-Command (Join-Path $Script.InstalledLocation $Script.Name)
        }
        # Index into tools with each missing tool and splat the user & project to Install-GitHubRelease
        foreach ($tool in $Tools[$missing.TargetObject]) {
            Write-Information "Installing $tool"
            &$installer @tool
        }
    }