gluesql / gluesql / 17708417516

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Implement proc macro for row conversion and add payload helpers (minimal SELECT→struct) (#1779)

Adds a new proc-macro crate (gluesql-macros) and re-exports its derive; implements a core row-conversion module with errors, traits, and result extensions; integrates RowConversionError into core Error; updates workspace manifests and CI to include and test the macros; and adds many compile-fail and runtime tests exercising conversions.

e.g.
```rust
use gluesql::FromGlueRow;
use gluesql::core::row_conversion::SelectResultExt;

#[derive(Debug, PartialEq, FromGlueRow)]
struct User {
    id: i64,
    name: String,
    email: Option<String>,
}

// Many results
let users: Vec<User> = glue
    .execute("SELECT id, name, email FROM users")
    .await?
    .rows_as::<User>()?;

// One result
let user: User = glue
    .execute("SELECT id, name, email FROM users WHERE id = 1")
    .await?
    .one_as::<User>()?;
```

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