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errors: return more detailed errors when failing to parse or apply patch

Authored by martinvonz.

Description

errors: return more detailed errors when failing to parse or apply patch

This patch adds subclasses of PatchError so we can distinguish
between failure to parse a patch from failure to apply it. It updates
the callers to raise either InputError or StateError depending on
which type of error occurred.

Differential Revision: https://phab.mercurial-scm.org/D11824