Addition of debug formatting support to rusqlite types

[visceralfield]

I think this could be useful for debugging purposes -- I am interested to hear others' opinions. I have not attempted implementing this yet, I don't know how many types could just be derived and how many would require actual code. If there is interest, I may start a branch.

[gwenn]

Do you mean:

pub trait FromSql: Sized+Debug {
...
}

pub trait ToSql: Debug {
...
}

Or

impl Debug for Backup {
...
}
impl Debug for ... {
...
}

?

[visceralfield]

The second was my intention.

[ghost]

It would be great if Rows for example could simply be viewed with dbg!() or printed out.