specs: add ROLE restart policy #936
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This allows restarting a single role when the scheduler supports specific role restarts. Not all schedulers support this and this PR doesn't add support for it in any of the existing open source schedulers.
Volcano doesn't support multiple roles and thus we can't support role level restart with the very limited action policy https://pkg.go.dev/volcano.sh/apis@v1.9.0/pkg/apis/bus/v1alpha1#Action
This follows the pattern in #922. Role is sufficiently generic so is a valid fit for OSS specs.
Test plan: