Convert Uuid to a url friendly 22 character string blob

For the purpose of using in a unique url, but still shorted than the 36 character stringified uuid

Example usage

```rust

let uuid = Uuid::parsestr("557c8018-5e21-4b74-8bb0-9040e2e8ead1").unwrap(); asserteq!("VXyAGF4hS3SLsJBA4ujq0Q", blobuuid::toblob(uuid)); ```

uuid | blob ----------------------------------------|------------------------- 8ef65ee9-a039-4bf2-a4b3-687fcc1f3cc3 | jvZe6aA5SKks2hzB88ww c38ba949-491b-417d-b488-aa4748c13a00 | w4upSUkbQX20iKpHSME6AA d1504e8e-dff6-4b9b-a0b1-50c447b5d1a4 | 0VBOjt2S5ugsVDER7XRpA 8f5159c4-0438-45f1-a7e1-f30c84258082 | j1FZxAQ4RfGn4fMMhCWAgg 6aaf25bd-7d59-4331-87a1-4ddacf6aa52c | aq8lvX1ZQzGHoU3az2qlLA 95af4181-bbbc-4b0c-9d9a-c14fa0a18c65 | la9Bgbu8SwydmsFPoKGMZQ 2a317215-53fd-45de-95e9-f74c16a13b6a | KjFyFVP9Rd6V6fdMFqE7ag 8d2c25e2-73d6-4f4a-820a-f671c0991398 | jSwl4nPWT0qCCvZxwJkTmA 55458e6b-fcce-446e-884f-ca61a8fd7e9d | VUWOazORG6IT8phqP1-nQ