Restores `public`, `archived`, `mature`, `spam`, `deleted`, `lang_id`, and `WPLANG` to the `$meta` data passed to `wpmu_new_blog`. This hook was deprecated in 5.1.0, but code using it still relies on this data.
Props david.binda, pbiron.
Fixes#46351.
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By providing distinct files for the site and network APIs, a better overview is provided. Prior to this change, the `ms-blogs.php` file had grown too big, mixing site APIs, network APIs and related legacy APIs that need to be maintained. Since multisite is often used in unexpected ways, backward-compatibility is ensured by including the two new files from `ms-blogs.php`, which previously contained all functions that have been moved to the new files.
This changeset does not contain any functional changes.
Fixes#40647.
Built from https://develop.svn.wordpress.org/trunk@44472
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