[Epic] TDB (IPROTO) 2.x: future plans

[xuniq]

This epic includes tickets for the upcoming 2.x releases.

SME: @ a1div0 @ Galiev-Ruslan @ Satbek @ mooncfrat2019
Client-oriented plans (spreadsheet): https://docs.google.com/spreadsheets/d/1WNJPARAn1xUZxjGQD_HOzdQJendiePyoGdBDzTaf2vw/edit?gid=0#gid=0

Total estimation: ≈

Details

Future releases:

• [2.x] TDB (iproto): Config storage doesn't require space permissions anymore #5194
• [2.x] TDB (IPROTO): Architecture #4567
• [2.x] TDB (IPROTO): обновленный модуль migrations #4390
• [2.x] TDB (IPROTO): авто разрешение конфликтов репликации #4547
• [2.x] TDB (IPROTO): HTTP(s) API #4546
• [2.x] TDB (IPROTO): Kafka connector #4545
• [2.x] TDB (IPROTO): proofread the docs for 2.x versions #4582
• [2.x] TDB (IPROTO): документация к типовому проекту #4554