Add an option to enable timestamps in node logs

[evgeniiz321]

Logs without timestamps can sometimes be hard to read.

info	neofs-ir/main.go:156	prometheus is enabled
info	neofs-ir/main.go:156	pprof is enabled
info	core/blockchain.go:234	initial gas supply is not set or wrong, setting default value	{"InitialGASSupply": "52000000"}

Adding timestamps, e.g. 13:29:05.707384 to each log entry would significantly increase logs' usefulness.

[roman-khimov]

Related to #2779 and #2982. You can get them if you run the node with tty. But configuration can be useful as well.