Handle graceful shutdown on SIGTERM

[chancez]

Presto should be able to handle signals and perform the appropriate shutdown tasks as needed.

From what I can tell, if you had separate initialization/run for https://github.com/prestosql/presto/blob/master/presto-main/src/main/java/io/prestosql/server/PrestoServer.java#L70 then Presto could:

• create the PrestoServer object (with all modules setup)
• register a shutdown handler which calls the shutdown handler associated with the PrestoServer object
• Call the PrestoServer run() method

[oneonestar]

Are there anyone looking into this issue? (cc: @electrum)

[mm-matthias]

This used to work for some time, but now it's broken with trino:446.