opt: defer drop of old pages in page cache til end

[rphmeier]

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[rphmeier]

• opt: allocate vectors ahead-of-time in page cache commit #657
• opt: defer drop of old pages in page cache til end #656 👈 (View in Graphite)
• opt: do not copy pages before bitbox writeout #655 : 1 other dependent PR (#648 )
• refactor: add WriteArc io command #654
• refactor: have page cache handle writing page ID rather than bitbox #653
• refactor: merklize into copied pages #652
• refactor: add deep Clone to FatPage #651
• master

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[gabriele-0201]

Beside gt restack being needed, 97f5eff looks good!

Just to be sure I got it right, before cache_entry.page_data = updated_page.page.freeze().inner; was dropping in place the FatPage leading to some computation that is better to be deferred to the end of the critical path (technically during the wal writing, before the beginning of the ht writing).