DeliveryFeeFactor: StorageDescriptor<[], bigint, false, never>

The number to multiply the base delivery fee by.

This factor is shared by all bridges, served by this pallet. For example, if this chain (Config::UniversalLocation) opens two bridges ( X2(GlobalConsensus(Config::BridgedNetworkId::get()), Parachain(1000)) and X2(GlobalConsensus(Config::BridgedNetworkId::get()), Parachain(2000))), then they both will be sharing the same fee factor. This is because both bridges are sharing the same local XCM channel with the child/sibling bridge hub, which we are using to detect congestion:

 ThisChain --- Local XCM channel --> Sibling Bridge Hub ------
                                           |                   |
                                           |                   |
                                           |                   |
                                         Lane1               Lane2
                                           |                   |
                                           |                   |
                                           |                   |
                                          \ /                  |
 Parachain1  <-- Local XCM channel --- Remote Bridge Hub <------
                                           |
                                           |
 Parachain1  <-- Local XCM channel ---------

If at least one of other channels is congested, the local XCM channel with sibling bridge hub eventually becomes congested too. And we have no means to detect - which bridge exactly causes the congestion. So the best solution here is not to make any differences between all bridges, started by this chain.