* Add fn to validate egress routes
* Add blank tests
* Reject routing to non existent parachains
* Reject if routing to self
* Reject if egress route parachain ids out of order
* Extract method for checking egress routes
* Reject empty egress routes
* Extract test method
* Generate empty trie root constant in build script
* Remove unwraps
* Hardcode EMPTY_TRIE_ROOT and add test to verify
* Const not pu