Add functions in MultipatchConnectivity class

[PaulineVidal]

To compute derivatives at the interfaces, I need other functionnalities in the MultipatchConnectivity class,

• I would like to loop over the Interfaces (so have an equivalent object that what returns get_all_idx_ranges_along_direction for a given starting Grid1D). They can be stored in a ddc::TypeSeq.
• Similarly, I need a ddc::TypeSeq of Patches along one direction to be able to get the right function values from a MultipatchType of functions.
• For two given Patches, to able to determine all the Interfaces between both patches. E.g. it returns a ddc::TypeSeq of Interfaces usually with one element but for special geometries, can handle also the case where several interfaces connect two patches.