quic: increase timeout and keep alive #4695
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Note: reopening #4585, reverted in #4637, to investigate CI issues
Problem
Quic timeout and keep alive are very low.
When a validator is not leader, it still has thousands of connections open that are not expected to send any data.
Because keep alive is 1s, each client sends a quic ping every second, which is a lot of unnecessary traffic.
Summary of Changes
Increased timeout to 30s and keep alive to 20s.