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dirstate-v2: Add heuristic for when to create a new data file

Authored by SimonSapin.

Description

dirstate-v2: Add heuristic for when to create a new data file

… instead of appending to the existing one. This is based on keeping track
of how much of the existing data is not used anymore.

Differential Revision: https://phab.mercurial-scm.org/D11097