feat(ui): Add icons for newUI

[WarningImHack3r]

To support IDEA's new UI since 2022.3, there are a couple of steps to follow to upgrade the plugin's icons.

However, despite the strict following of the docs, I cannot manage to have something working. If someone has a bit of time to lose and enough experience in that domain, I'm open to paths to figure out a working implementation.

With the current files of this PR, I can make the IDE use the new icons, however they are so small that they only appear as a dot in the tool windows' bar.

It's far from being high-priority, as the current "old" icons work very fine even on the new UI, so there is in theory no need to even update them, but still.

[github-actions]

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