HTTP API: Adds BC-layer /library/Requests.php file.
When the Requests 2.0.0 autoloader detects the older (deprecated) `Requests` class, it attempts to load its `/library/Requests.php` file. Prior to this commit, this file did not exist in Core. Thus, a fatal error happened.
Why not change Requests Autoloader?
Requests is an external dependency that Core consumes. It is also used by other projects outside of Core. Thus, Core needs a fix to guard itself to prevent a fatal error.
The fix:
- Adds the missing
wp-includes/Requests/library/Requests.php file, which then loads the wp-includes/class-requests.php (which will throw a deprecation notice to alert developers to upgrade).
- Adds a test.
Follow-up to [54997].
Props bjorsch, costdev, jrf, mukesh27, peterwilsoncc, ironprogrammer, hellofromTonya.
Fixes #57341.