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scmutil: introduce filterrequirements() to split reqs into wc and store ones

Authored by pulkit.

Description

scmutil: introduce filterrequirements() to split reqs into wc and store ones

In upcoming patches where we try to implement requirements in store, we will
need a mechanism to split all requirements on some basis and decide which one
goes to .hg/requires and which one goes to .hg/store/requires.

This patch introduce a separate function for that. Filtering logic for now is
put under an if False:. In upcoming patches it will be removed.

Differential Revision: https://phab.mercurial-scm.org/D8913