Add more information on the TLS properties to the filtering log

[ameshkov]

This might require adding a new callback (onSessionStarted or smth like this).
Or we could simply pass it to onBeforeRequest?

Here's what makes sense to add there:

1. TLS version
2. Selected cipher
3. Original certificate (I know we're going to expose it through the browser assistant, but having it in the log is also useful)

What else?

[sfionov]

IMHO displaying selected cipher in browser assistant will be useful too, because browsers shows that.

[ameshkov]

Well, we can simply use the same cipher for the browser<->AG connection

[sfionov]

Well, we can simply use the same cipher for the browser<->AG connection

We don't generate ECDSA certs for now, so it will not be easy.

[ameshkov]

Ah, makes sense

[billkewl]

Is Adguard able to generate ECDSA certs now? after CoreLibs ver. 1.15.25?
#360

If so. How to regenerate a new cert?