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config: rework credentials to support priv sync

Before this patch, credentials applier used to just grant all privileges
and permissions with {if_not_exists = true}. It didn't allow removing a
permission, nor setting only new permissions.

Now credentials applier converts box configuration and desired config to
an intermediate representation, calculates diff for them and only after
that applies the diff.

Part of #8967

NO_DOC=yet

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