feat: implement sized list syntax support (list<type, size>)

Fizes #57

Signed-off-by: Gordon Smith <GordonJSmith@gmail.com>

Author: GordonSmith

syntaxes/wit.tmLanguage.json

@@ -1200,7 +1200,7 @@
         },
         "list": {
             "name": "meta.list.ty.wit",
-            "comment": "Syntax for WIT types such as list",
+            "comment": "Syntax for WIT types such as list with optional size parameter",
             "begin": "\\b(list)\\b(\\<)",
             "beginCaptures": {
                 "1": {
@@ -1218,6 +1218,24 @@
                     "name": "meta.types.list.wit",
                     "include": "#types"
                 },
+                {
+                    "name": "meta.list-size-separator.wit",
+                    "match": "\\s*(,)\\s*",
+                    "captures": {
+                        "1": {
+                            "name": "punctuation.comma.wit"
+                        }
+                    }
+                },
+                {
+                    "name": "meta.list-size.wit",
+                    "match": "\\b([0-9]+)\\b",
+                    "captures": {
+                        "1": {
+                            "name": "constant.numeric.integer.list-size.wit"
+                        }
+                    }
+                },
                 {
                     "include": "#whitespace"
                 }

test-unused-imports.wit

@@ -0,0 +1,25 @@
+package foo:foo;
+
+interface sized-lists {
+  // Regular lists without size
+  simple-list: func(l: list<u32>);
+  
+  // Sized lists with fixed length
+  ipv4-address: func() -> list<u8, 4>;
+  ipv6-address: func() -> list<u16, 8>;
+  small-buffer: func(data: list<u8, 16>) -> list<u8, 32>;
+  
+  // Nested structures with sized lists
+  complex-data: func() -> tuple<list<u32, 4>, list<string, 2>>;
+  record-with-sized-list: func() -> record-type;
+}
+
+record record-type {
+  id: u32,
+  data: list<u8, 10>,
+  tags: list<string, 5>,
+}
+
+world sized-lists-world {
+  export sized-lists;
+}