`BinlogEvent`: publish `ServerID()` function #1112

Job	Run time
Set push variable	1s
Build and push vttestserver (mysql80)	2m 2s
Build and push lite (latest)	2m 13s
Build and push lite (percona80)	2m 17s
Build and push (bullseye, vtadmin)	1m 8s
Build and push (bullseye, vtorc)	27s
Build and push (bullseye, vtgate)	41s
Build and push (bullseye, vttablet)	46s
Build and push (bullseye, mysqlctld)	40s
Build and push (bullseye, mysqlctl)	37s
Build and push (bullseye, vtctl)	32s
Build and push (bullseye, vtctlclient)	42s
Build and push (bullseye, vtctld)	1m 2s
Build and push (bullseye, vtctldclient)	40s
Build and push (bullseye, logrotate)	16s
Build and push (bullseye, logtail)	25s
Build and push (bullseye, vtbackup)	44s
Build and push (bullseye, vtexplain)	29s
Build and push (bookworm, vtadmin)	1m 12s
Build and push (bookworm, vtorc)	27s
Build and push (bookworm, vtgate)	29s
Build and push (bookworm, vttablet)	37s
Build and push (bookworm, mysqlctld)	42s
Build and push (bookworm, mysqlctl)	30s
Build and push (bookworm, vtctl)	40s
Build and push (bookworm, vtctlclient)	42s
Build and push (bookworm, vtctld)	1m 10s
Build and push (bookworm, vtctldclient)	40s
Build and push (bookworm, logrotate)	30s
Build and push (bookworm, logtail)	22s
Build and push (bookworm, vtbackup)	42s
Build and push (bookworm, vtexplain)	27s
	24m 52s

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