Title: Jitter for tcp proxy max_downstream_connection_duration

Description:
To prevent thundering herd problems when using Envoy as an L4 proxy, we'd like to introduce a jitter option for the max_downstream_connection_duration in the TCP proxy: https://www.envoyproxy.io/docs/envoy/latest/api-v3/extensions/filters/network/tcp_proxy/v3/tcp_proxy.proto

It would be configured as a jitter duration. The actual max duration would then be configured as max_downstream_connection_duration + random(0, max_downstream_connection_duration_jitter).

I could implement this in the next weeks if this is something the community would be interested in.

Relevant Links:
A similar issue was previously discussed in #35391. Progress here stalled because nobody implemented it.