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changelog: change the implementation of `_divertopener`

Authored by marmoute.

Description

changelog: change the implementation of _divertopener

During a transaction, new data to the changelog index are "diverted". The
previous implementat ways pretty basic, we need something better to be able to
use the changelog vfs fully during transaction. (eg: accessing the vfs options).

Differential Revision: https://phab.mercurial-scm.org/D8185

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