Stabilise SIP-52 (`@publicInBinary`)

[hamzaremmal]

Tasks:

• Stabilise @publicInBinary (Stabilise @publicInBinary #22591);
• Write the language reference page and the specification;
• Should we make it @preview? (Scala Core's decision will follow next week)

[hamzaremmal]

Core's decision on February 26th, 2025 was to make SIP-52 stable in 3.7.0. The SIP was accepted for shipping in February 2025.