JBInboxTreeRoot
The root of an inbox tree for a given token in a JBSucker.
Inbox trees are used to receive from the remote chain to the local chain. Tokens can be claimed from the
inbox tree.
Notes:
- 
member: nonce Tracks the nonce of the tree. The nonce cannot decrease.
 - 
member: root The root of the tree.
 
struct JBInboxTreeRoot {
    uint64 nonce;
    bytes32 root;
}