Add the last `;` to any list-like structure

[janmasrovira]

At the moment the last ; is optional and the formatter removes it. We've received some feedback that it would be more practical if the formatter always inserted the last ; if it was missing. This includes

1. Let blocks.
2. Fields.
3. List literals.
4. Statements in a module.
5. Using/hiding lists in open statements.

It is possible that I missed something in the above list.