feat: rename Sequence.list method to toList and update all call sites

The `.list` method on Sequence was renamed to `.toList` to better reflect its
purpose of converting a sequence into a List object. This change updates the
method definition in `builtin/core.wren` and `src/vm/wren_core.c`, along with
all test files that called `.list` on sequences, maps, ranges, and custom
sequence implementations. The test file `test/core/sequence/list.wren` was also
renamed to `test/core/sequence/to_list.wren` to match the new method name.

src/vm/wren_core.c

@@ -137,7 +137,7 @@ static const char* libSource =
 "    return result\n"
 "  }\n"
 "\n"
-"  list {\n"
+"  toList {\n"
 "    var result = new List\n"
 "    for (element in this) {\n"
 "      result.add(element)\n"