Needs bracket pair colorization

[cee-chen]

VSCode 1.67 released bracket pair colorization as defaulting to on: https://code.visualstudio.com/updates/v1_67#_bracket-pair-colorization-enabled-by-default

Unfortunately it looks like the default bracket colors are very primary and clash with Spacegray's more delicate muted tones. It would be awesome if this theme or a contributor were willing to add complementary bracket highlighting colors. I believe the JSON tokens are the ones listed in this SO answer: https://stackoverflow.com/a/68885221/4294462

[mihai-vlc]

I am happy to accept contributions if anybody wants to open a PR with this