RFR: 8343535: IGV: Colorize nodes on demand [v6]

[Tobias Holenstein]

> <img width="292" alt="color" src="https://github.com/user-attachments/assets/ea050a39-5f1e-456b-adaa-2102d78b0f60">
> 
> <img width="697" alt="pick" src="https://github.com/user-attachments/assets/67569b5d-1d74-4a93-8a97-bb37c5bc9f93">
> 
> <img width="428" alt="nodes" src="https://github.com/user-attachments/assets/c8a994e3-9946-42ae-8701-34223a000a0c">
> 
> Adds new option to IGV to color selected nodes:
> 1) select some nodes
> 2) `Ctrl + C` or `View` -> `Color action`
> 3) pick a color and apply

Tobias Holenstein has updated the pull request incrementally with one additional commit since the last revision:

  refactor getTextColor()

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/21925/files
  - new: https://git.openjdk.org/jdk/pull/21925/files/f0b78af7..30dc5261

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21925&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21925&range=04-05

  Stats: 34 lines in 2 files changed: 9 ins; 10 del; 15 mod
  Patch: https://git.openjdk.org/jdk/pull/21925.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21925/head:pull/21925

PR: https://git.openjdk.org/jdk/pull/21925