[Elephant] Changed field action to aliasAction in AddressAlias and MosaicAlias

[evias]

With elephant-2 released, the field named action was changed to aliasAction in both AddressAlias and MosaicAlias mappers.

Source:

• https://github.com/nemtech/catapult-server/commit/835def4330cfe346bc5f48ee444c3048e08e92fd#diff-0c132641572c3d27a8e12ad3717dcb1dR35
• https://github.com/nemtech/catapult-server/commit/835def4330cfe346bc5f48ee444c3048e08e92fd#diff-b3109b75570af418a7d755aeed346142R35

This may introduce inconsistencies with REST schemas (DTOs updates) and SDK models.

Ref: symbol/catapult-rest#54