feat(neodim): support v2

[Jint-lzxy]

I'm not sure why nvim_get_hl returns a decimal RGB value instead of a hex string.

@ayamir @CharlesChiuGit Have u encountered similar issues?

:=vim.api.nvim_get_hl(0, { name = "Normal" })

Returns

{
  bg = 1973806,
  fg = 13489908
}
Press ENTER or type command to continue

But according to the documentation, it should return:

{
  bg = #1E1E2E,
  fg = #CDD6F4
}
Press ENTER or type command to continue

[ayamir]

It returns the former: