ADO Symbol Proxy

Inspired by this comment.

I couldn't get Windows Performance Analyzer to recognize the Azure DevOps symbol server due to

1. Authentication required
2. Redirect responses

This server handles both problems by posing as a symbol server that proxies requests to Azure DevOps. It makes requests to Azure DevOps' symbol server endpoint using a PAT, and then follows any redirects so it can send the bits back directly.

Usage

1. Set the ADO_PAT environment variable with your PAT.
2. Build/run this project.
3. Add the proxy's URL to your symbol path, e.g. srv*C:\Symbols*https://localhost:44340/api/symbols/download.
4. Reload symbols in WPA/PerfView/WinDbg/Visual Studio.