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Copy Rails 7 Preloader files into the partitioning gem

Marius Bobin requested to merge 377521-copy-rails-7-preloader into master

What does this MR do and why?

Related to #377521 (closed)

This MR builds on top of !108223 (merged) by copying the Rails 7 Preloader classes into the gem's namespace as they are. The preloader is not functional/enabled because it needs patches to the reflection classes to support its full functionality.

I've extracted this out of !105237 (closed) for easier review iterations.

Implementation steps

Description Reference
Add gem scaffolding !108223 (merged)
👋 Copy Rails 7 Preloader files into the gem !108224 (closed)
Complete the preloader with patches !108225 (closed)
Make the gem configurable for safer rollout !108229 (closed)
Actively require the gem !108239 (closed)

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Edited by Marius Bobin

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