refactor: Implement From<sqlx::Error> and clean up fix_error (#3484)

In the database crates for atuin-server, there is `fn fix_error`. This
PR implements `From<sqlx::Error>` on `DbError` which makes it possible
to mostly use `?` to bubble up the errors.

There are cases where `?` is not being used e.g.
```rust
    async fn get_session(&self, token: &str) -> DbResult<Session> {
        sqlx::query_as("select id, user_id, token from sessions where token = $1")
            .bind(token)
            .fetch_one(&self.pool)
            .await
            .map_err(fix_error)
            .map(|DbSession(session)| session)
    }
```

There are two options
## 1. Use `Into::into`
```rust
    async fn get_session(&self, token: &str) -> DbResult<Session> {
        sqlx::query_as("select id, user_id, token from sessions where token = $1")
            .bind(token)
            .fetch_one(&self.pool)
            .await
            .map_err(fix_error)
            .map(|DbSession(session)| session)
    }
```

## 2. Create a variable and use `?`
```rust
    async fn get_session(&self, token: &str) -> DbResult<Session> {
        let session = sqlx::query_as("select id, user_id, token from sessions where token = $1")
            .bind(token)
            .fetch_one(&self.pool)
            .await
            .map(|DbSession(session)| session)?;
        Ok(session)
    }
```

I chose to do option 1 as it was just a find/replace but say the word
and I'll convert them all to option 2

## Checks
- [X] I am happy for maintainers to push small adjustments to this PR,
to speed up the review cycle
- [X] I have checked that there are no existing pull requests for the
same thing

1 files changed, 4 insertions, 3 deletions

diff --git a/crates/atuin-server-database/Cargo.toml b/crates/atuin-server-database/Cargo.toml
index e361c68b..52ccbf97 100644
--- a/crates/atuin-server-database/Cargo.toml
+++ b/crates/atuin-server-database/Cargo.toml
@@ -12,9 +12,10 @@ repository = { workspace = true }
 [dependencies]
 atuin-common = { path = "../atuin-common", version = "18.16.1" }
 
-tracing = { workspace = true }
-time = { workspace = true }
+async-trait = { workspace = true }
 eyre = { workspace = true }
 serde = { workspace = true }
-async-trait = { workspace = true }
+sqlx = { workspace = true }
+time = { workspace = true }
+tracing = { workspace = true }
 url = "2.5.2"