RFR: 7894: Provide an alternative Java based flamegraph visualization

[Brice Dutheil]

This change introduces a possible replacement for the current flamegraph view.

**Motivation**
The current is based on a web view. In the current state, 
- the web view can be slow to render especially when the tree is large.
- the web view don't feel well integrated, in particular when popups are shown.
- web view are difficult to work with from a JMC developer perspective.

![image](https://user-images.githubusercontent.com/803621/177537938-423a4d53-c2ac-4c56-8583-abe4cc910e37.png)

**Description**
Concretely this PR relies on the swing component to render flamegraphs : https://github.com/bric3/fireplace. And plays with the bridge between SWT and AWT via the `SWT_AWT` class.

As the intent of this view is to eventually replace the current one, the icons are the same.

Since fireplace has no actual release, only snapshots, in order to try this PR, it is necessary to install the snapshot manually before starting the p2 server.


cd releng/third-party

mvn dependency:get -DrepoUrl=https://s01.oss.sonatype.org/content/repositories/snapshots -Dartifact=io.github.bric3.fireplace:fireplace-swing:0.0.1-SNAPSHOT:jar

# if sources are wanted
mvn dependency:get -DrepoUrl=https://s01.oss.sonatype.org/content/repositories/snapshots -Dartifact=io.github.bric3.fireplace:fireplace-swing:0.0.1-SNAPSHOT:jar:sources

# make the p2 site, don't forget the -U
mvn p2:site -U; mvn jetty:run


**Outstanding issues / limitation**
- [x] Fireplace has not yet a stable release as some part of its API are a bit rough.
- [x] Currently the view does not initializes correctly:
   the swing `JScrollPane` don't show scroll bars, until the view is resized by the user. I lack the SWT / Swing expertise to understand why at this time.
   https://github.com/bric3/fireplace/issues/79
- [x] Fireplace only supports _icicle_ view at this time.
   https://github.com/bric3/fireplace/issues/22
- [x] Icons for minimap toggle and zoom reset
   <img width="237" alt="image" src="https://user-images.githubusercontent.com/803621/183126781-07af0e94-a5d5-458c-97e3-a5e012177248.png">
- [x] Export to image
   https://github.com/bric3/fireplace/issues/99
- [x] Export to print ?
   Can be done at a later time
- [x] release of fireplace

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

Commit messages:
 - Use fireplace pre-release 0.0.1-rc3
 - Adds zoom animation support
 - Use the new fireplace swt-swt bridge
 - Use #637CA5 instead of light gray #3b3b3b
 - Use #3b3b3b instead of black for icons
 - Make copyrights headers attributed to datadog in 2022
 - Adds reset zoom and minimap icons
 - Avoid dead-locking the main thread with	AWT-EventQueue-0
 - Make the code Java 1.8 compliant
 - Supports saving to image
 - ... and 8 more: https://git.openjdk.org/jmc/compare/cd7b6e6c...2e0428cf

Changes: https://git.openjdk.org/jmc/pull/408/files
 Webrev: https://webrevs.openjdk.org/?repo=jmc&pr=408&range=00
  Issue: https://bugs.openjdk.org/browse/JMC-7894
  Stats: 1202 lines in 35 files changed: 1182 ins; 6 del; 14 mod
  Patch: https://git.openjdk.org/jmc/pull/408.diff
  Fetch: git fetch https://git.openjdk.org/jmc pull/408/head:pull/408

PR: https://git.openjdk.org/jmc/pull/408