Add ability to set the session cookie's domain

[greg84]

We have a site that spans two sub-domains. We can't join user session specific telemetry from the two domains unless the ai_session cookie can be set for the root domain.

It would be great if we could set something like config.sessionCookieDomain to solve the problem.

[SergeyKanzhelev]

Dup for this: #64

[github-actions]

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