[Epic] TDB (IPROTO): release 3.1

[xuniq]

This epic includes tickets for the upcoming 3.1 release.

Dev epic for 3.1 release:
SME: @ a1div0 @ Galiev-Ruslan @ Satbek @ mooncfrat2019
Release date: ?
Дата старта техрайтерских работ: ?
Total estimation: ?

Details

• [3.x] TDB (IPROTO): searching tuples in TCM #5337
• [3.x] TDB (iproto): update structure of the upcoming what's new docs #5381
• [3.x] TDB (iproto): add atomic_iteration and on_full_scan_complete options to cooler reference #5389