Add support for CLUSTER MYSHARDID

[e920528]

Description

Fix #2457

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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)?

[leibale]

Can you please add an integration test? (using testUtils, you can use this for reference)

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (a217cc1) 95.71% compared to head (a6cb891) 95.72%.
Report is 1 commits behind head on master.

❗ Current head a6cb891 differs from pull request most recent head 01bd0b6. Consider uploading reports for the commit 01bd0b6 to get more accurate results

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2528   +/-   ##
=======================================
  Coverage   95.71%   95.72%           
=======================================
  Files         458      459    +1     
  Lines        4531     4535    +4     
  Branches      506      506           
=======================================
+ Hits         4337     4341    +4     
  Misses        127      127           
  Partials       67       67           

Files Changed	Coverage Δ
packages/client/lib/client/commands.ts	100.00% <100.00%> (ø)
packages/client/lib/commands/CLUSTER_MYSHARDID.ts	100.00% <100.00%> (ø)

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[e920528]

@leibale Thank you for reviewing!
I'll try to add the integration test when I have time, maybe next week.

[leibale]

@e920528 [email protected]/@redis/[email protected] is on npm 🎉