D6709: config: add --registered flag to show all known configs

[pulkit (Pulkit Goyal)]

pulkit added a comment.


  In D6709#100698 <https://phab.mercurial-scm.org/D6709#100698>, @av6 wrote:
  
  > And to make the review process easier, I propose doing this in 3 or 4 patches:
  >
  > - adding `--registered`: will simply show all registered options in key=value format
  > - adding defaults and experimental/devel/debug statuses to `showconfig --debug` output (this one can be split into two)
  > - showing config options in a human-friendly format
  
  +1. I also agree that splitting it into patches will help ease the discussion and review.

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  https://phab.mercurial-scm.org/D6709/new/

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  https://phab.mercurial-scm.org/D6709

To: navaneeth.suresh, #hg-reviewers, av6, marmoute, durin42
Cc: durin42, mharbison72, yuja, pulkit, marmoute, av6, mjpieters, mercurial-devel