Expose LogisticContainer.logistic_mode property

[mickael9]

This would be useful for the Advanced Logistics System mod to allow recognizing other logistic containers like those from the Warehousing mod in the right categories (passive provider, requester, etc.)

Currently the only way to do that is to serialize data.raw (or parts of it) into a an already exposed property (or rely on the fact that the item has "requester/provider/..." in its name)

[Nexela]

Implemented in .14.4 as LuaEntityPrototype.logistic_mode read

Yay for awesome devs.