This pull request removes, in full, our dependency on cpprestsdk. This
allows us to shed 500KiB-1.2MiB from our package off the top and enables
the following future investments:
- Removal of the App CRT forwarders to save an additional ~500KiB
- Switching over to the HybridCRT and removing our dependency on _any
CRT_.
cpprest was built on my dev box two or so years ago, and is in _utter_
violation of our compliance guidelines on SBOM et al.
In addition, this change allows us to use the proxy server configured
in Windows Settings.
I did this in four steps (represented roughly by the individual commits):
1. Switch from cpprest's http_client/json to Windows.Web.Http and
Windows.Data.Json
2. Switch from websocketpp to winhttp.dll's WebSocket implementation¹
3. Remove all remaining utility classes
4. Purge all dependencies from all projects and scripts on cpprest.
I also took this opportunity to add a feature flag that allows Dev
builds to run AzureConnection in-process.
¹ Windows.Networking.Sockets' API is so unergonomic that it was simply
infeasible (and also _horrible_) to use it.
## Validation Steps
I've run the Azure Connection quite a bit inproc.
Closes#4575.
Might be related to #5977, #11714, and with the user agent thing maybe #14403.
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