add setter and getter for comming soon setting to api

[roo2]

Changes proposed in this Pull Request

Adds wpcom_public_coming_soon to the setting endpoint GET and POST endpoints

Testing instructions

Apply the generated diff, or checkout this branch and then run yarn dev --sync from ./apps/editing-toolkit/ to sync to your sandbox.

In a rest client calls the settings endpoint:

Test the POST

POST https://public-api.wordpress.com/rest/v1.4/sites/172971117/settings
Authorization: {{ authorization taken from browser }}
Cookie: {{ cookie taken from browser }}
{
	"wpcom_public_coming_soon": 1
}

Test the GET

GET https://public-api.wordpress.com/rest/v1.1/sites/172971117/settings
Authorization: {{ authorization taken from browser }}
Cookie: {{ cookie taken from browser }}

You should see "wpcom_public_coming_soon": 1 included in the response

[matticbot]

Test live: https://calypso.live/?branch=add/public-coming-soon-to-settings-endpoint

[matticbot]

This PR does not affect the size of JS and CSS bundles shipped to the user's browser.

Generated by performance advisor bot at iscalypsofastyet.com.

[matticbot]

Caution: This PR affects files in the Editing Toolkit Plugin on WordPress.com
Please ensure your changes work on WordPress.com before merging.

D49466-code has been created so you can easily test it on your sandbox. See this FieldGuide page about developing the Editing Toolkit Plugin for more info: PCYsg-ly5-p2

[ramonjd]

@adamziel

We're adding this filter like you did in D37770-code.

Any reason not to do it in the Editing Toolkit?

[adamziel]

Because of all the async/distributed stuff, It took some days of drawing to figure out the phabricator parts - I'm not familiar with editing toolkit enough to be able to answer your question @ramonjd :(

[ramonjd]

Tested using https://developer.wordpress.com/docs/api/console-2014/

Confirmed that GET on sites/$site_id/settings returns settings: { ..., wpcom_public_coming_soon: 0 } in the body