Feature request: provide `.ps1` install script for Windows

TinyTeX currently provides the Windows installer as a batch file which requires more steps to use than its Linux/macOS counterpart. It would be nice if there was a powershell version that could be downloaded and executed in a single command, e.g iwr -useb https://deno.land/install.ps1 | iex.

For context, I would like to add one-liner instructions for how to install TinyTeX in https://github.com/saadq/resumake.io

# Shell (Mac, Linux)
$ curl -sL https://yihui.org/tinytex/install-bin-unix.sh | sh

# PowerShell (Windows)
$ iwr -useb https://yihui.org/tinytex/install-bin-windows.ps1 | iex

By filing an issue to this repo, I promise that

• I have fully read the issue guide at https://yihui.org/issue/.
• I have provided the necessary information about my issue.
  • If I'm asking a question, I have already asked it on Stack Overflow or RStudio Community, waited for at least 24 hours, and included a link to my question there.
  • If I'm filing a bug report, I have included a minimal, self-contained, and reproducible example, and have also included xfun::session_info('tinytex'). I have upgraded all my packages to their latest versions (e.g., R, RStudio, and R packages), and also tried the development version: remotes::install_github('rstudio/tinytex').
  • If I have posted the same issue elsewhere, I have also mentioned it in this issue.
• I have learned the Github Markdown syntax, and formatted my issue correctly.

I understand that my issue may be closed if I don't fulfill my promises.

Start by reviewing the existing Windows batch installer and the named install-bin-unix.sh flow, then define the equivalent install-bin-windows.ps1 entry point. Done means the PowerShell script can be downloaded and executed as a one-liner to install TinyTeX on Windows.