add dynamic state to attribute list

[rshriram]

This PR has no API level changes. It adds two new attributes (one for http and one for tcp, similar to the sni attribute added recently). These attributes correspond to the dynamic metadata generated in Envoy by various filters (metadata includes attributes and valuable logging info generated by various codecs).

related to istio/proxy#2013 and
istio/istio#9613

Signed-off-by: Shriram Rajagopalan shriramr@vmware.com

[qiwzhang]

/lgtm
/approve

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