bundle2: move part iterator a separate class
Currently, the part iterator logic is tightly coupled with the part handling
logic, which means it's hard to replace the part handling logic without
duplicating the part iterator bits.
In a future diff we'll want to be able to replace all part handling, so let's
begin refactoring the part iterator logic to it's own class.
Differential Revision: https://phab.mercurial-scm.org/D703
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