Changes
1.Rebuild the rmrk-pre_check and rmrk-post_transfer hook functions.
pre_check:

1. Ensure the transferred Nft is belong to the delegation collections.
2. Under condition 1), ensure the sender and recipient have no Nft listed in related collection.
3. Under condition 2), ensure the sender has free value larger than the transferring Nft has.

post_check:
Merge recipient's Nfts in related collection after the transfer.

2.Forbid any status change of a user's Nft in a pool that the Nft is listed including contribute, wtihdraw in both stakepools and vault, claim_owner_shares in vault.

3.Remove unused pallet stake_pool and legacy codes for stakepoolv2 migration.