Unable to parse 'max' for optional precision column with MS Sql dialect

The following is a valid MS Sql query, but cannot ne parsed due to the `varbinary` implementation.

Variable character-based columns, `nvarchar` and `varchar`, use a union type `CharacterLength` type that allows for either `IntegerLength` or `Max` values. The `varbinary` implementation needs a similar union, such as `BinaryLength` (reusing `CharacterLength` seems to have a naming mismatch).

```
#[test]
fn parse_ms_sql_varbinary_max(){
let sql = "CREATE TABLE example(VarBinaryMaxCol varbinary(max) not null);";
let parsed = ms().parse_sql_statements(sql);

assert!(parsed.is_ok());
}
```

Start with the varbinary implementation and compare it with the CharacterLength handling described in the issue. Run the provided parse_ms_sql_varbinary_max test; done means the MS SQL CREATE TABLE statement with varbinary(max) parses successfully.

Written by the indexing model from the issue text.