RFR: 8055: Improvement in stacktrace view for Duration [v6]

[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:

  Implemented the review comments to handle ticks better

-------------

Changes:
  - all: https://git.openjdk.org/jmc/pull/475/files
  - new: https://git.openjdk.org/jmc/pull/475/files/29164453..5f715dd5

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jmc&pr=475&range=05
 - incr: https://webrevs.openjdk.org/?repo=jmc&pr=475&range=04-05

  Stats: 18 lines in 1 file changed: 5 ins; 9 del; 4 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