Please support specifying --features for only some of the crates

[kdy1]

Hi! Thank you for creating a wonderful tool!

I'm using codspeed for the swc project and I want to enable scoped of swc_allocator while benchmarking. But it seems like cargo codspeed build passes the --features flag to all invocations of cargo build.

I think it should be supported.

[art049]

Hello @kdy1, yes, we want to support that. We plan on refactoring cargo-codspeed to use the cargo CLI under the hood instead of the cargo API (#50). This kind of configuration will be available out of the box when this is done.

Meanwhile, you can build packages individually with the feature flag (since we support the -p flag already).
Building would look like this:

cargo codspeed build -p my_package --features my_feature
cargo codspeed build -p another_package

And then just cargo codspeed run will run all the built benchmarks.