RFR: 8055: Improvement in stacktrace view for Duration [v7]

[Suchita Chaturvedi]

> 1. Added a new column for Duration. It will be populated only when the "Show Duration" toggle icon is clicked. Not by default.
> 2. Fixed NaN issue for screens where duration is not present.
> 3. Added timeunit to make tooltip more meaningful.
> 
> Please refer JIRA description for more details.

Suchita Chaturvedi has updated the pull request incrementally with one additional commit since the last revision:

  Removed null check for Duration

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Changes:
  - all: https://git.openjdk.org/jmc/pull/475/files
  - new: https://git.openjdk.org/jmc/pull/475/files/5f715dd5..dfed0370

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jmc&pr=475&range=06
 - incr: https://webrevs.openjdk.org/?repo=jmc&pr=475&range=05-06

  Stats: 9 lines in 1 file changed: 0 ins; 6 del; 3 mod
  Patch: https://git.openjdk.org/jmc/pull/475.diff
  Fetch: git fetch https://git.openjdk.org/jmc.git pull/475/head:pull/475

PR: https://git.openjdk.org/jmc/pull/475