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I encountered a use case while converting a project
from Diesel to sqlx, where I had a custom Postgres enum
which included a snake case field name:
```rust
pub enum JobStatus {
NotRun,
Finished,
Failed,
}
```
Which translates to:
```sql
CREATE TYPE job_status AS ENUM ('not_run', 'finished', 'failed');
```
This is likely to be a semi-common use case,
so this commit adds snake case support for enums
via the `#[sqlx(rename_all = "snake_case")]` attribute.