Code optimization (openkruise#25)

* code optimization rollout

Signed-off-by: liheng.zms <liheng.zms@alibaba-inc.com>

* changelog 0.1.0

Signed-off-by: liheng.zms <liheng.zms@alibaba-inc.com>

* github workflow e2e test

Signed-off-by: liheng.zms <liheng.zms@alibaba-inc.com>

* Optimize rollout state transition related code

Signed-off-by: liheng.zms <liheng.zms@alibaba-inc.com>