[autoparallel] change the following nodes strategies generation logic #1636
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This PR changes the following nodes(nodes will be merged into other nodes) strategies generation logic, new version handlers for following nodes will keep the duplicated strategies. To avoid the duplicated check in StrategiesConstructor, handler will attatch the index of input strategy on new strategy name.
This behavior will not increase the seaching space, because no matter how many strategies generated by handler, the following nodes will be merged and solver won't create a new variable for it.