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dirstatemap: create `_dirs_incr/_dirs_decr` methods on the common class

Authored by marmoute.

Description

dirstatemap: create _dirs_incr/_dirs_decr methods on the common class

The Rust wrapper does not need them. However having a default, no-op,
implementation will help use to write code used by both implementation.

Differential Revision: https://phab.mercurial-scm.org/D11570