[tor-bugs] #27112 [Core Tor/Stem]: Decouple payload processing from pop/unpack + tune abstraction layers

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#27112: Decouple payload processing from pop/unpack + tune abstraction layers
---------------------------+------------------------------
 Reporter:  dmr            |          Owner:  dmr
     Type:  enhancement    |         Status:  needs_review
 Priority:  Medium         |      Milestone:
Component:  Core Tor/Stem  |        Version:
 Severity:  Normal         |     Resolution:
 Keywords:  client         |  Actual Points:
Parent ID:                 |         Points:
 Reviewer:  atagar         |        Sponsor:
---------------------------+------------------------------

Comment (by dmr):

 (I'm a few days late in adding a comment for bookkeepings' sake.)

 PR branch updated again!
 "dropped" the `--no-ff` merge commit, 9 commits added, then force-pushed.
 (Everything else the same. This shares a common base of
 `b47ea8edacdff2d4a3644e95af9c40a6c3536a5d`, so everything after that is
 new.)

 This adds these from [comment:2 comment 2]:
 > === Next-steps summary:
 > 1. implement Cell `check_digest()`
 > 2. implement Cell `encrypt()`
 > 3. implement Cell `decrypt()`
 ... and a few other things (the commits describe it pretty well)

 PR at:
 https://github.com/torproject/stem/pull/8
 New branch head `e8a7599110bd25bd5139c691a634ba1ab2e3449e`

 Old revs / bases available here:
 ||= comment =||= head =||= branch tree url =||
 || [comment:1] || `e02cf0edb1292f67c87df95c7a406e5f94c1e7a8` ||
 ​https://github.com/dmr-x/stem/tree/27112-relay-cell-processing-
 abstraction-old ||
 || [comment:4] || `f3f44a2f4572d3535ae6f2ea7f9788450fc61a20` ||
 ​https://github.com/dmr-x/stem/tree/27112-relay-cell-processing-
 abstraction-old-2 ||

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27112#comment:5>
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