feat(ft): added vala support (#414)

[Vala Comments](https://wiki.gnome.org/Projects/Vala/Tutorial#Comments)

Author: yyyyyiiiiii

lua/Comment/ft.lua

@@ -166,6 +166,7 @@ local L = setmetatable({
     typescriptreact = { M.cxx_l, M.cxx_b },
     typst = { M.cxx_l, M.cxx_b },
     v = { M.cxx_l, M.cxx_b },
+    vala = { M.cxx_l, M.cxx_b },
     verilog = { M.cxx_l },
     vhdl = { M.dash },
     vim = { M.vim },