Add ability to configure TLS session cache key
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enhancement
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Description
Add ability to configure TLS session cache key, so that sessions stored in `ClientContextImpl` can be retrieved by a specific key(s) (e.g. `%UPSTREAM_CLUSTER%` - which is effectively what we have right now, `%UPSTREAM_HOST%` or `%REQ(:AUTHORITY)%`).
See https://github.com/envoyproxy/envoy/issues/3817 and https://github.com/envoyproxy/envoy/pull/4791 for some background.
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