JBMessageRoot
Information about the remote (inbox) tree's root, passed in a message from the remote chain.
Notes:
- 
member: token The address of the terminal token that the tree tracks.
 - 
member: amount The amount of tokens being sent.
 - 
member: remoteRoot The root of the merkle tree.
 
struct JBMessageRoot {
    address token;
    uint256 amount;
    JBInboxTreeRoot remoteRoot;
}