Provide Context to scheduler plugins

[zwpaper]

The general idea would be use context wherever you can:

1. the chained calls in PreFitler/Filter can use the context that is provided by scheduler framework
2. for calls outside PreFilter/Filter/..., we should instantiate one at the start of main() (or make some change in scheduler framework to expose it), and pass it to all plugins

Originally posted by @Huang-Wei in #655 (comment)

/kind enhancement

[k8s-ci-robot]

@zwpaper: The label(s) kind/enhancement cannot be applied, because the repository doesn't have them.

In response to this:

       The general idea would be use context wherever you can:

1. the chained calls in PreFitler/Filter can use the context that is provided by scheduler framework
2. for calls outside PreFilter/Filter/..., we should instantiate one at the start of main() (or make some change in scheduler framework to expose it), and pass it to all plugins

Originally posted by @Huang-Wei in #655 (comment)

/kind enhancement

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[ffromani]

/cc

[lianghao208]

To enhance the scheduler framework, do we need to introduce a new parameter into PluginFactory function in k/k framework/runtime/registry.go? so that we can instantiate each plugin with one consolidate context.

[Huang-Wei]

To enhance the scheduler framework, do we need to introduce a new parameter into PluginFactory function in k/k framework/runtime/registry.go?

Yes, that would be an ideal way. I noticed this has been implemented - as a by-product of 116884 (in v1.29)

[Huang-Wei]

Changing milestone to v1.29.

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/lifecycle stale

[zwpaper]

let me have a look at it in following days

/remove-lifecycle stale

[han-so1omon]

new contributor. gonna take a look as well. @zwpaper if you already have a solution let me know