Oliver Gugger f9f8f6406b config+lnd: allow configuring gRPC keepalive settings ...

This change allows users to customize the gRPC keepalive settings. The
server ping values configure when the server sends out a ping by itself
and how quickly the client is expected to respond.
The client ping min wait configures the minimum time a client has to
wait before sending another ping. A connection might be closed by the
server if a client pings more frequently than the allowed min wait time.

We choose lower default values than the gRPC library used before:
 - ServerPingTime: 1 minute instead of 2 hours
 - ClientPingMinWait: 5 seconds instead of 5 minutes

This should by itself already make long-standing gRPC streams more
stable but also allow clients to set a custom client ping time of 5
seconds or more (a value of slightly more than 5000 milliseconds should
be chosen to avoid the server disconnecting due to slight timing skews).

2023-06-09 10:57:36 +02:00

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