Add support for Encrypted Client Hello (ECH)

[A-Posthuman]

It seems this is something that has to also be enabled on the server side, but from the Chrome note here they support it in 117:

https://chromestatus.com/feature/6196703843581952

https://blog.cloudflare.com/announcing-encrypted-client-hello/

[perkfly]

This extension has landed in Chrome 119.

[StephanvanSchaik]

This also seems to be available in Firefox 118, and enabled by default since Firefox 119.

[Ghxst]

probably want to track https://github.com/curl/curl/pull/11922 ?

[lachesis]

That patch is landed. Using it would seem to require updating curl_impersonate to target some version of curl newer than 8.8.0.