watch placementscore during scheduling

[qiujian16]

refactor eventhandler using index

Signed-off-by: Jian Qiu jqiu@redhat.com

[openshift-ci]

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[qiujian16]

#87

[qiujian16]

@haoqing0110 should I add a test to ensure it can reflect on score update or there is already one?

[haoqing0110]

@qiujian16 we have a benchmark testing on the placement decision generation with addon score. https://github.com/open-cluster-management-io/placement/blob/main/test/benchmark/benchmark_test.go. But the score doesn't change so far, may need to update that.

[elgnay]

/lgtm
/hold Hold the PR in case someone else wants to take a look.

[rokej]

I tested this with two hosting clusters. As placement score changes, I saw an immediate change in the placement decision. Thank you so much!

[qiujian16]

/unhold