Make generate-service-descriptor thread-safe again

[wendigo]

SimpleDateFormat is not thread-safe which causes plugin to fail with the cryptic errors like For input string: "E.404E2"

[wendigo]

This is now on-par with the maven-assembly plugin outputTimestamp handling

[wendigo]

(base) ➜  target git:(master) ✗ ls -la io/trino/plugin/mysql
total 248
drwxr-xr-x  15 mateuszgajewski  staff    480 May 16 00:57 .
drwxr-xr-x   3 mateuszgajewski  staff     96 May 16 00:57 ..
-rw-r--r--   1 mateuszgajewski  staff    494 May 16 00:57 ImplementAvgBigint.class
-rw-r--r--   1 mateuszgajewski  staff   1430 May 16 00:57 MySqlClient$1.class
-rw-r--r--   1 mateuszgajewski  staff   1474 May 16 00:57 MySqlClient$2.class
-rw-r--r--   1 mateuszgajewski  staff   1437 May 16 00:57 MySqlClient$3.class
-rw-r--r--   1 mateuszgajewski  staff    872 May 16 00:57 MySqlClient$4.class
-rw-r--r--   1 mateuszgajewski  staff   5111 May 16 00:57 MySqlClient$ColumnHistogram.class
-rw-r--r--   1 mateuszgajewski  staff   1749 May 16 00:57 MySqlClient$ColumnIndexStatistics.class
-rw-r--r--   1 mateuszgajewski  staff   7264 May 16 00:57 MySqlClient$StatisticsDao.class
-rw-r--r--   1 mateuszgajewski  staff  64410 May 16 00:57 MySqlClient.class
-rw-r--r--   1 mateuszgajewski  staff   5391 May 16 00:57 MySqlClientModule.class
-rw-r--r--   1 mateuszgajewski  staff   2201 May 16 00:57 MySqlConfig.class
-rw-r--r--   1 mateuszgajewski  staff   1561 May 16 00:57 MySqlJdbcConfig.class
-rw-r--r--   1 mateuszgajewski  staff    446 May 16 00:57 MySqlPlugin.class

(base) ➜  target git:(master) ✗ ls -la META-INF/services
total 8
drwxr-xr-x  3 mateuszgajewski  staff   96 May 29 12:12 .
drwxr-xr-x  5 mateuszgajewski  staff  160 May 29 12:15 ..
-rw-r--r--  1 mateuszgajewski  staff   34 May 16 00:57 io.trino.spi.Plugin