RFR: 8343535: IGV: Colorize nodes on demand [v4]

[Tobias Holenstein]

On Fri, 8 Nov 2024 11:29:47 GMT, Christian Hagedorn <chagedorn at openjdk.org> wrote:

> Looks good! Just tried it out. One more thing I've noticed: When selecting a color for a node and then trying to color another node, the color selection resets back to `#ffffff`. Would be nice if the last selection would have been stored. But I'm not sure how easy this is. Could also be done separately.

![Screenshot 2024-11-08 at 15 27 06](https://github.com/user-attachments/assets/6dbf0732-f643-4ee2-add9-6adaee380fc0)

right. I have updated it now to save the last colors and provide some default colors

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PR Comment: https://git.openjdk.org/jdk/pull/21925#issuecomment-2464903951