fix(): redis never throws key does not exist

[e11sy]

Issue

In redis time series keys were created without retention — that leads to memory leaks, since keys are never archived

Cause

from redis docs

Notes:
When specified key does not exist, a new time series is created.

so when we called tsAdd method and waited for TSDB: key does not exist error we did it wrong

it never fires an error, but it automatically creates the key with retention 0 as we saw on stage

Solution

first — create key if not exists
second — increment key that was created with valid retention in the previous step