Better error message when using array ellipsis not type annotated

Currently, array ellipsis need to have type annotation. When the type is not specified, an error is produce. Below is a sample error message.
```
0018: let test_me: Addr[2] = [ Addr: 0, ...];
~~~~~~~~~~~~~~~~~~~~~^------^ XlsTypeError: uN[64][2] vs uN[64][1]: Annotated type did not match inferred type of right hand side expression.
```

There are two possible solutions: 1- Perform type deduction on the rhs when the array uses ellipsis, 2- Use a better error message when array ellipsis are used (e.g. "XlsError: Please annotate the type when using array ellipsis.").