RFR: 8327884: JFR view: Improve time display accuracy to milliseconds

[Long Yang]

Could I have a review of this patch for [8327884](https://bugs.openjdk.org/browse/JDK-8327884) ?

Now the time display accuracy is seconds. It's better if we can display milliseconds, especially when printing original events.
This is a break change, consider this is a command line utility, it's acceptable.

Testing:
test/jdk/jdk/jfr/tool/TestView.java
test/jdk/jdk/jfr/jcmd/TestJcmdView.java

All passed.

Thanks

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Commit messages:
 - 8327884: JFR view: Improve time display accuracy to milliseconds

Changes: https://git.openjdk.org/jdk/pull/18219/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18219&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327884
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/18219.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18219/head:pull/18219

PR: https://git.openjdk.org/jdk/pull/18219