fix: remove union typedef (#28)

BREAKING CHANGE: The `union` type has been removed from
the WIT grammar.


Unions were
[removed](WebAssembly/component-model#237) from
WIT and the Component Model recently.

Signed-off-by: Till Schneidereit <till@tillschneidereit.net>

Author: tschneidereit

src/extension.ts

@@ -37,7 +37,6 @@ const keywords = [
   "resource",
   "static",
   "type",
-  "union",
   "use",
   "variant",
   "with",

syntaxes/wit.tmLanguage.json

@@ -577,9 +577,6 @@
         {
           "include": "#record"
         },
-        {
-          "include": "#union"
-        },
         {
           "include": "#flags"
         },
@@ -897,42 +894,6 @@
         }
       ]
     },
-    "union": {
-      "name": "meta.union-items.wit",
-      "comment": "Syntax for WIT like `union \"id\" {`",
-      "begin": "\\s*\\b(union)\\b\\s+((?<![\\-\\w])([a-z][0-9a-z]*|[A-Z][0-9A-Z]*)(([\\-])([a-z][0-9a-z]*|[A-Z][0-9A-Z]*))*)\\s*(\\{)\\s*",
-      "beginCaptures": {
-        "1": {
-          "name": "keyword.other.union.union-items.wit"
-        },
-        "2": {
-          "name": "entity.name.type.declaration.id.union-items.wit"
-        },
-        "7": {
-          "name": "punctuation.brackets.curly.begin.wit"
-        }
-      },
-      "patterns": [
-        {
-          "include": "#comment"
-        },
-        {
-          "name": "meta.types.union-cases.wit",
-          "include": "#types"
-        },
-        {
-          "name": "punctuation.comma.wit",
-          "match": "\\s*(\\,)"
-        }
-      ],
-      "end": "\\s*(\\})\\s*",
-      "applyEndPatternLast": 1,
-      "endCaptures": {
-        "1": {
-          "name": "punctuation.brackets.curly.end.wit"
-        }
-      }
-    },
     "types": {
       "name": "meta.ty.wit",
       "comment": "Syntax for WIT types corresponding to the interface types specification",