[Feature] Export community OpenRank metric

[frank-zsy]

Description

As implemented in #1493 , we added community OpenRank task in OpenDigger.

Then we need to add an interface to get community OpenRank metric in OpenDigger and export the data too.

NOTE: we need to transform the community OpenRank to an unified value, so we can compare the contribution across different repositories.

[open-digger-bot]

This issue has not been replied for 24 hours, please pay attention to this issue: @gymgym1212 @xiaoya-yaya @xgdyp

[frank-zsy]

/self-assign

[frank-zsy]

To export the data for a demo like this, we need to export the following data for repo in every month:

• All the active nodes in the month, with the initial value of the node, the weight it relies on initial value, the type of the node.
• For all the relationships in the network, the start and end index of the nodes, the weight to transfer the value within 0 to 1.

Since the values will only be used in the calculation procedure and community OpenRank task will only return the final value for every node, we need to embed the store process in the calculation stage which is in the community OpenRank task.