router: add callro methods based on node zone#391

Draft

eugenepaniot wants to merge 4 commits intotarantool:masterfrom eugenepaniot:add-zone-based-replica-lb

+42-2

Commits on Jan 10, 2023

Add callro methods based on node zone
eugenepaniot
committed

Commits on Jan 17, 2023

Update comments
eugenepaniot
committed

Commits on Jan 22, 2023

Use strings as load-balancing algorithm identificator
eugenepaniot
committed

Commits on Feb 15, 2023

Update test/router/router.result add new funct
eugenepaniot
committed