[wp-trac] [WordPress Trac] #65096: Add `is_user_member_of_blog` filter

[WordPress Trac]

#65096: Add `is_user_member_of_blog` filter
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 Reporter:  dd32             |      Owner:  (none)
     Type:  enhancement      |     Status:  new
 Priority:  normal           |  Milestone:  Awaiting Review
Component:  Role/Capability  |    Version:
 Severity:  normal           |   Keywords:
  Focuses:  multisite        |
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 WordPress uses `is_user_member_of_blog()` in the rest api controllers to
 prevent the user endpoints running for non-members of the site.

 For WordPress.org this caused an issue as 'no' users are members of the
 site on which we wanted users to be able to use the rest-api endpoints for
 various account purposes.

 This was resolved through faking the metadata such that it always returned
 truthful, without granting additional capabilities:
 https://github.com/WordPress/wporg-two-
 factor/pull/348#issuecomment-4206959949

 I've run into another use-case for it, where I want to dynamically grant a
 user access to a site, but I don't want to give the user a role directly.
 Causing me to use the same metadata filter approach.

 A filter on `is_user_member_of_blog` would make this a lot simpler.

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Ticket URL: <https://core.trac.wordpress.org/ticket/65096>
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