feat(cubestore): Support negative priority for queue

[ovr]

Hello!

refs #5042

Thanks

[codecov]

Codecov Report

Base: 41.31% // Head: 41.31% // No change to project coverage 👍

Coverage data is based on head (4512914) compared to base (ff724f7).
Patch has no changes to coverable lines.

❗ Current head 4512914 differs from pull request most recent head 698d797. Consider uploading reports for the commit 698d797 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6031   +/-   ##
=======================================
  Coverage   41.31%   41.31%           
=======================================
  Files         151      151           
  Lines       20039    20039           
  Branches     5214     5214           
=======================================
  Hits         8279     8279           
  Misses      10920    10920           
  Partials      840      840           

Flag	Coverage Δ
cube-backend	41.31% <ø> (ø)

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[waralexrom]

LGTM 👍