WIP: Add Method to query vesting delegatees

Ray Neiheiserrequested to merge
vesting-delegatees into 0.23.0

This adds the necessary methods to query vesting delegatees (incoming delegations) from the nodes via:

  • get_vesting_delegatees

I was unable to build it on my system and virtual box is not working either (and I can't use the lab computers because of corona). So this has to be tested yet.

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