first stab at adding new nvim-treesitter highlight capture groups

[ikirudennis]

According to https://github.com/nvim-treesitter/nvim-treesitter/issues/2293, there are a whole bunch of new highlight capture groups. I mainly noticed this breaking change as it related to https://github.com/tpope/vim-fugitive/issues/2091. I largely copy-pasted this from https://github.com/folke/tokyonight.nvim/blob/main/lua/tokyonight/theme.lua and tweaked things until it seems mostly right for a bunch of spot-checks. I can't guarantee it's complete or completely correct, but in my limited testing, it seems to work.