Add support for JSON.MERGE

[shacharPash]

Description

Describe your pull request here

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Checklist

• Does npm test pass with this change (including linting)?
• Is the new or changed code fully tested?
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?

Closes #2500

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (67d9c3c) 95.67% compared to head (4eb9384) 95.67%.

❗ Current head 4eb9384 differs from pull request most recent head cee764e. Consider uploading reports for the commit cee764e to get more accurate results

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2511   +/-   ##
=======================================
  Coverage   95.67%   95.67%           
=======================================
  Files         455      456    +1     
  Lines        4552     4556    +4     
  Branches      522      522           
=======================================
+ Hits         4355     4359    +4     
  Misses        128      128           
  Partials       69       69           

Impacted Files	Coverage Δ
packages/json/lib/commands/MERGE.ts	100.00% <100.00%> (ø)

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[kiyaGu]

Hi @shacharPash @leibale, do you know when this feature is going to be available?

[leibale]

@kiyaGu we are waiting for RedisJSON 2.6 to be released, see here

[arsengoian]

@leibale looks like it has been released several weeks ago