automatically merge multiple use statements from the same crate

[hailangx]

Currently, rustfmt does not automatically merge multiple use statements from the same crate or module into a single, aligned use statement. For example, given the following imports:

use crate::backend::index::build::InsertBuildStats;
use crate::backend::index::update::UpdateStageResults;
use crate::utils::{self, fmt, MaybeDisplay};
use crate::{
    backend::index::update::UpdateResults,
    benchmark::inputs::async::InplaceDeleteMethod,
    utils::{datafiles::UpdateOperationType, percentiles,},
};

It would be preferable if rustfmt could merge and align these into a single, more concise and organized statement, such as:

use crate::{
    backend::index::{
        build::InsertBuildStats,
        update::{UpdateStageResults, UpdateResults},
    },
    benchmark::inputs::async::InplaceDeleteMethod,
    utils::{self, fmt, MaybeDisplay, datafiles::UpdateOperationType, percentiles},
};

Expected Behavior:

rustfmt should automatically merge and align use statements that share a common root.
The merged statement should be formatted according to rustfmt’s existing style conventions for multi-line imports.
Motivation:

Merging imports improves code readability and reduces duplication.
It also helps maintain a cleaner and more idiomatic Rust codebase.
Request: Please consider adding an option or enhancing the default behavior to merge and align related use statements as illustrated above.

[ytmimi]

Please see the docs on imports_granuality.

What you're asking for can be achieved when setting imports_granularity=Crate:

output using imports_granularity=Crate

use crate::{
    backend::index::{
        build::InsertBuildStats,
        update::{UpdateResults, UpdateStageResults},
    },
    benchmark::inputs::async::InplaceDeleteMethod,
    utils::{self, MaybeDisplay, datafiles::UpdateOperationType, fmt, percentiles},
};