[wp-trac] [WordPress Trac] #43192: Switch Plugins & Themes to use the `info/1.2` API endpoints

[WordPress Trac]

#43192: Switch Plugins & Themes to use the `info/1.2` API endpoints
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 Reporter:  dd32             |      Owner:
     Type:  task (blessed)   |     Status:  new
 Priority:  normal           |  Milestone:  5.0
Component:  Upgrade/Install  |    Version:
 Severity:  normal           |   Keywords:
  Focuses:                   |
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 Currently the Plugin & Theme API uses the "old" php serialized endpoint
 available at `info/1.0`.

 We should switch to using the latest endpoint, which for both plugins and
 themes is `info/1.2`.

 There's a few notable changes in the API:
  - JSON instead of PHP
  - GET requests only, to aid in network caching (the WordPress version is
 also sent in the URL to allow differentiation on the server-side)
  - JSON doesn't allow us to return both assoc arrays and objects, so
 there's some back-compat casting involved client-side
  - The endpoint may now return a more specific error message than
 "something went wrong" (which may have meant, "That's a 404")
  - The fields returned by the endpoint have changed, and match what
 WordPress (trunk) currently uses. That means there's no need to send
 feature flags (`fields`) in 5.0, but future versions can do so.
  - The Plugin Contributor details are returned with full names (#29274)
  - The Theme Authors are now returned with full names too

 Most of the relevant API changes are on
 https://meta.trac.wordpress.org/ticket/111

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Ticket URL: <https://core.trac.wordpress.org/ticket/43192>
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