[tor-bugs] #31241 [Core Tor/Tor]: Refactor config validation

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#31241: Refactor config validation
-----------------------------------------+---------------------------------
 Reporter:  nickm                        |          Owner:  nickm
     Type:  task                         |         Status:  assigned
 Priority:  Medium                       |      Milestone:  Tor:
                                         |  0.4.2.x-final
Component:  Core Tor/Tor                 |        Version:
 Severity:  Normal                       |     Resolution:
 Keywords:  network-team-roadmap-august  |  Actual Points:
Parent ID:  #29211                       |         Points:  1.5
 Reviewer:                               |        Sponsor:  Sponsor31-can
-----------------------------------------+---------------------------------

Comment (by nickm):

 This has a branch (`ticket31241`) based on #31240.  There is a merge-
 branch, `ticket31241_merged_1`.

 https://github.com/torproject/tor/pull/1266 is the PR for the merge-
 branch, but note that many of the commits on it are part of #31240.

 I will summarize the changes here below.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31241#comment:1>
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