Duplicate Local ILinks Fixes + Block Modal

[mukul-mehta]

• Because we used the addILink function along with mex-backend, we ended up with duplicate copies of specific ILink elements. Now we do not use the addILink function and use the addNodeOrNodes function within the useNewNodes hook call. This causes no duplicates and updates the local data store and hierarchy on mex-backend
• Add Block Modal to move/send/delete blocks to different nodes. This is till work in progress but will be finished in another PR

[linear]

WD-1357 [TASK] Block Modal and Create ILink Fixes

Since mex-backend now returns the ILinks, we don't need to create them locally. This was causing an issue of the same ILink being created twice, leading to a white screen.

Now we have a new hook useNewNodes that is used to create new nodes instead of locally creating an ilink with useDataStore

Add Block Modal that allows creating a new node or task from a block

Created by Mex