Add support for nvim-ts-rainbow

[tarsobcaldas]

The plugin nvim-ts-rainbow2 implements a way to alternate colors between delimiters. It would be nice if the color parameters used were included on this color scheme as well.

[fbearoff]

You can add new HL groups in the overrides section of the config, here are some suggestions for the wave theme:

TSRainbowRed = { fg = colors.palette.autumnRed },
TSRainbowYellow = { fg = colors.palette.carpYellow },
TSRainbowBlue = { fg = colors.palette.dragonBlue },
TSRainbowOrange = { fg = colors.palette.surimiOrange },
TSRainbowGreen = { fg = colors.palette.springGreen },
TSRainbowViolet = { fg = colors.palette.oniViolet },
TSRainbowCyan = { fg = colors.palette.waveAqua1 },

[aliaksandr-trush]

nvim-ts-rainbow2 plugin is deprecated.
But for rainbow-delimiter plugin (that is suggested replacement) HL groups added in #248