Add lua lsp (#2560)

book/src/generated/lang-support.md

@@ -50,7 +50,7 @@
 | llvm | ✓ | ✓ | ✓ |  |
 | llvm-mir | ✓ | ✓ | ✓ |  |
 | llvm-mir-yaml | ✓ |  | ✓ |  |
-| lua | ✓ |  | ✓ |  |
+| lua | ✓ |  | ✓ | `lua-language-server` |
 | make | ✓ |  |  |  |
 | markdown | ✓ |  |  |  |
 | meson | ✓ |  | ✓ |  |

languages.toml

@@ -605,9 +605,10 @@ name = "lua"
 scope = "source.lua"
 file-types = ["lua"]
 shebangs = ["lua"]
-roots = []
+roots = [".luarc.json", ".luacheckrc", ".stylua.toml", "selene.toml", ".git"]
 comment-token = "--"
 indent = { tab-width = 2, unit = "  " }
+language-server = { command = "lua-language-server", args = [] }
 
 [[grammar]]
 name = "lua"