* Simplify logging code in flutter_driver
It appears nobody is benefitting from this logic, so we may as well not pay the cost.
* Make all of the driver interface public.
This is the second attempt at this; it should be better than before because the Logger interface, which conflicted in various places, no longer exists.
See #45733 for original attempt.
This reverts commit 0ce9206ef457fcd59b203544244a9bedf0a9ac31 (PR #45924).
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