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httpx: use context for propagating transaction info

The final barrier for using context for propagating transaction info
is the usage of DialTLS inside the http transport.

By switching to using DialContext instead, and by delegating to the
net/http transport the TLS handshake, we can propagate the context
everywhere, so we can always put measurements in context.

While working on that, I realised that the split between a TLS
handshake start and a TLS handshake done event was reasonable since
it allowed us to put I/O events between these two events in the
right context (i.e. TLS handshake I/O) as well.

In the same vein, I should probably split the Resolve event into
two separate events, to put resolve operations in context.

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