Diesel should support u64 for sqlite

[burnthoney]

I was scrolling through the docs and noticed UNIGNED BIT INT existed.

https://www.sqlite.org/c3ref/int64.html
for the c api it seems it supports it as well

[weiznich]

Your image is part of the type affinity example table from the SQLite documentation. The first column shows type name strings and the second column shows the underlying type affinity used by SQLite. In turn that means even if you specify the type as UNSIGNED BIG INT SQLite will use a INTEGER column as storage. This column can hold data between i64::MIN and i64::MAX, which is different than having a u64 there.