lexeme merging: implement ChangeOps

Authored by Pablo-WMDE on Jul 19 2018, 1:29 PM.

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lexeme merging: implement ChangeOps

TDD-style development of lexeme-specific parts of entity merging.
Integrates with statement merging provided by wikibase.

Bug: T199314
Bug: T198106
Depends-On: I12d8119224fe2d53b69aaf204656dff596bff7b3
Change-Id: Ie364fc57cc2f70dcf53f6c0d0c0a557e7c62b65a