RFR: JDK-8297007: IGV: Link/Unlink node selection of open tabs

[Tobias Holenstein]

In IGV graphs can be opened in several tabs and then display them side-by-side. Previously, when the user selected nodes in tab A the selection was also applied in tab B. 

We now introduce a new global button to link and unlink the selection of different tabs.
![link_button](https://user-images.githubusercontent.com/71546117/201961318-e1263f6c-b3e9-41d5-a1f1-5493d5294bb5.png)

If the button is **pressed**, the selection is **linked** globally across tabs: 
![linked](https://user-images.githubusercontent.com/71546117/201960953-88f90c74-1c87-4c29-9881-47b55e7c26b9.png)

If the button is **not pressed**, the selection is **not linked** across tabs. This is the default setting:
![unlinked](https://user-images.githubusercontent.com/71546117/201961012-f531e7b9-1f23-4584-b207-02529ae25d5a.png)

# Implementation
The `SelectionCoordinator` is responsible to update the other tabs when the selection changes. We simply disable the `SelectionCoordinator` when the link button is not pressed, and enable it otherwise.

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Commit messages:
 - GlobalSelectionAction

Changes: https://git.openjdk.org/jdk/pull/11171/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11171&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8297007
  Stats: 93 lines in 5 files changed: 74 ins; 5 del; 14 mod
  Patch: https://git.openjdk.org/jdk/pull/11171.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11171/head:pull/11171

PR: https://git.openjdk.org/jdk/pull/11171