feat: update SDK to work with refactored delegation pallet

[ntn-x2]

fixes KILTProtocol/ticket#1485

Merges DelegationBaseNode and DelegationNode into DelegationNode, deletes DelegationRootNode and adds DelegationHierarchyDetails.

Integration tests are passing if using the blockchain version refactoring the delegation pallet and the latest updated types. Of course, some tests are broken as we already use the new DID pallet on the server.

One thing that requires more attention is how to synchronise the state of a node with what's on the blockchain. For instance, how to fetch the latest vector of children IDs if new nodes are added under a given node. For the moment, I have added a utility function core/src/delegation/DelegationNode.utils.ts with the signature export async function getSyncedState(delegationNode: DelegationNode): Promise<DelegationNode> to update and return a node state. We might want to think about some other ways to do that.

Checklist:

• I have verified that the code works
• I have verified that the code is easy to understand
• I have left the code in a better state
• I have documented the changes (where applicable)

[rflechtner]

A bunch of suggestions but nothing critical. Nice work!

[ntn-x2]

@rflechtner good catches, thanks! I am not sure how to proceed now, as test cases are broken. Should we merge it? Should we not merge it?

[rflechtner]

@rflechtner good catches, thanks! I am not sure how to proceed now, as test cases are broken. Should we merge it? Should we not merge it?

I say merge it - the delegationNode tests succeed and that's enough for me. Tests are broken on develop and need fixing after the DID stuff is merged.
We should however first address the issue concerning the IDelegationHierarchyDetails interface before we merge:
#406 (comment)

[ntn-x2]

@rflechtner please take one last look at the changes. I found a bug in the refreshState() function which did not await for the data to be fetched from the chain. I also fixed the unit and integration tests which are now working again (for delegations).

[rflechtner]

@rflechtner please take one last look at the changes. I found a bug in the refreshState() function which did not await for the data to be fetched from the chain. I also fixed the unit and integration tests which are now working again (for delegations).

Looks good to me! Especially after the Object.assign() issue was solved