Re-bond Unbonding Chunks in dApps Staking

[Dinonard]

Description

Once stakers start the unbonding, their unbonded funds will remain locked during the unbonding period. During this period, these funds don’t generate any rewards neither can they be used for payment, transfer, etc.
This is normal and expected behavior.

However, we want to provide users an option to re-bond their unbonding chunks.
This allows them to continue earning rewards in dapps-staking and returns their unbonding chunks to locked state.

Details

• this is only applicable for users who have unbonding chunks
• it doesn't matter whether chunks have completed the unbonding period or not
• when used, all chunks should be consumed and re-bonded
• user can only select one target contract on which they want to re-bond

Required Tasks

• implement a new extrinsic call rebond_chunks (or something similar)
• unit tests
• runtime benchmarks code

Estimated done.

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Dependencies

This task has no dependencies but will require UI support to be utilized from the portal side.