Add WinGet configuration file for building terminal

[mdanish-kh]

Summary of the Pull Request

PR adds a WinGet configuration file to install the necessary dependencies in order to build terminal locally. The configuration file enables developer mode, installs PowerShell 7, Visual Studio 2022 & all the required workloads from the project's .vsconfig file (in accordance with the dependencies listed in the project's README).

Validation Steps Performed

Tested the configuration file by spinning up a clean Win11 Pro VM in azure and then doing the following:

1. Install latest WinGet on the VM using WinGet sandbox script. Install git and clone the repo
2. Run winget configure .config/configuration.winget (this should work by just double-clicking the file in explorer too)
3. After the configuration is completed, open the solution in the now installed Visual Studio and build. The build is successful and I could start terminal with F5

[carlos-zamora]

This looks great! Thanks for doing this :)