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config: add experimental argument to the config registrar

Authored by navaneeth.suresh.

Description

config: add experimental argument to the config registrar

Until now, there are almost 28 config items which are considered as
experimental but, not present in the experimental section of
the registrar. This patch adds an experimental argument to the
config registrar to mark such config items.

Differential Revision: https://phab.mercurial-scm.org/D6728