Introduce a new ModuleService for common module management operations

I just implemented PowerShell Gallery module update logic for the PowerShell ISE Preview and realized that this behavior really should be made available to all editors which use Editor Services. I'd like to take the work @dfinke did for PowerShell Gallery module installation and put it together with my module update checking logic to make a new ModuleService which has the following features:

• List and install modules from the PowerShell Gallery (and any other registered repository)
• Check for, get notified about, and install modules that have new updates
• Publish a module to the PowerShell Gallery (generally used for publishing a module from the current workspace path)

首先查看 @dfinke 在 PowerShell Gallery 中进行模块安装的工作，以及 issue 中引用的 PowerShell ISE Preview 模块更新逻辑。将这些现有行为与提议的共享 ModuleService 进行比较。当该服务支持通过已注册的存储库列出、安装、检查更新并发送通知、更新和发布模块时，即视为完成。