* Add psr-4 for the internal classes -- this is a temp. changes. We should remove it once we completely merge to the core
* Register class aliases
* Move WcPayPromotion classes to the internal
* Ignore namespace PHP CS issue
* Make features/WcPayPromotion internal
* Added src-internal directory for Automattic\WooCommerce\Internal\Admin namespace
* Moved src/Features/WcPayPromotion to src-internal/Admin/WcPayPromotion
* Add phpcs rules for src-internal
* Remove phpcs:ignoreFile
* Update letter case to make it PSR4 compatible
* Fix letter cases
* Move the alias array into the function
* Rename WcPayPromotion to WCPayPromotion (letter case update)
* Include src-internal
* Update letter case
* Make src/Schedulers/* internal, except the SchedulerTraits
* Add @internal comment tag
* Clean up incorrect import
* Remove unused import
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