Add world::run_pipeline<T>(ecs_ftime_t) overload

[ZeroErrors]

Changelog

• Add world::run_pipeline<T>(ecs_ftime_t) overload

Details

Was working with custom pipelines and noticed that this convenience overload was missing.

With this change instead of writing

ecs.run_pipeline(ecs.id<CustomPipeline>().entity());

You can now just do

ecs.run_pipeline<CustomPipeline>();

[SanderMertens]

LGTM, thanks for the PR!