feat: add Sequence.list method to convert any sequence into a List

Implements a new `list` method on the Sequence class that iterates over all elements and collects them into a new List instance. Includes documentation in the core sequence docs and a test case verifying correct behavior with a custom sequence implementation.

src/vm/wren_core.c

@@ -136,6 +136,14 @@ static const char* libSource =
 "\n"
 "    return result\n"
 "  }\n"
+"\n"
+"  list {\n"
+"    var result = new List\n"
+"    for (element in this) {\n"
+"      result.add(element)\n"
+"    }\n"
+"    return result\n"
+"  }\n"
 "}\n"
 "\n"
 "class String is Sequence {}\n"