Add configure_schedules to App and Schedules to apply ScheduleBuildSettings to all schedules

[DevinLeamy]

Objective

• Fixes: Add a method on App and Schedules to configure all schedules #9508
• Fixes: Add a getter for current schedule build settings #9526

Solution

• Adds

fn configure_schedules(&mut self, schedule_build_settings: ScheduleBuildSettings)

to Schedules, and App to simplify applying ScheduleBuildSettings to all schedules.

---

Migration Guide

• No breaking changes.
• Adds Schedule::get_build_settings() getter for the schedule's ScheduleBuildSettings.
• Can replaced manual configuration of all schedules:

// Old 
for (_, schedule) in app.world.resource_mut::<Schedules>().iter_mut() {
    schedule.set_build_settings(build_settings);
}

// New
app.configure_schedules(build_settings);

[alice-i-cecile]

Thanks!

[hymm]

I worry a little that there isn't a way to turn on say ambiguity detection for all schedules, but leave the rest of the settings untouched. But I think the predominant usage will be to just set all the schedules the same anyways, so going to approve and see what happens.

[alice-i-cecile]

That can still be done manually, using the workaround in the linked issue plus struct update syntax :) If that turns out to be a common pattern in practice though we can add a new method.

[hymm]

There's no getter for the current build settings, so you can't use the struct update syntax.

[DevinLeamy]

Clone because it's a light struct and we're not mutating the return value.

[DevinLeamy]

Makes sense to add the ability to chain configure_schedules() and #9526 to allow for:

  App::new()
        // ...
        .configure_schedules(ScheduleBuildSettings {
            ambiguity_detection: LogLevel::Error,
            ..schedule.get_build_settings()
        })
       // ...
       .run()