[wp-meta] [Making WordPress.org] #3474: Introduce `serve-happy` API endpoint

[Making WordPress.org]

#3474: Introduce `serve-happy` API endpoint
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 Reporter:  flixos90  |      Owner:
     Type:  task      |     Status:  new
 Priority:  normal    |  Milestone:
Component:  API       |   Keywords:  needs-patch needs-unit-tests
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 Per discussion in [this week's PHP
 meeting](https://wordpress.slack.com/archives/C60K3MP2Q/p1519056088000267),
 we would like to implement a basic endpoint for PHP version information
 handling, particularly to be used by core to check whether to show the PHP
 upgrade nag (see https://core.trac.wordpress.org/ticket/41191).

 The endpoint should live at `api.wordpress.org/core/serve-happy/` and do
 the following:
 * Return true/false for whether the passed PHP version needs to be
 upgraded.
 * Return true/false for whether the passed PHP version is insecure (no
 longer receives security updates).
 * Display relevant PHP versions on which the above "decisions" are based,
 plus WordPress' recommended PHP version.
 * Maybe also the latest PHP version available?
 * Maybe also the URL to the Servehappy education page? This would allow us
 to tweak it more flexibly and independently from core updates, just like
 the version numbers.

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Ticket URL: <https://meta.trac.wordpress.org/ticket/3474>
Making WordPress.org <https://meta.trac.wordpress.org/>
Making WordPress.org