NewTransport returns a POST-only Oblivious DoH transport. `id` identifies this transport. `endpoint` is the ODoH proxy that liaisons with the target. `target` is the ODoH resolver. `addrs` is a list of IP addresses to bootstrap endpoint dialers. `px` is the proxy provider, never nil.
(ctx context.Context, id, endpoint, target string, addrs []string, px ipn.ProxyProvider)
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