feat(instance): auto completion in rdb instance command

[jremy42]

close #3293

[codecov-commenter]

Codecov Report

❌ Patch coverage is 5.88235% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.78%. Comparing base (e110d2d) to head (d3e8161).
⚠️ Report is 1092 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/namespaces/rdb/v1/custom_instance.go	5.88%	16 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3605      +/-   ##
==========================================
- Coverage   75.86%   75.78%   -0.08%     
==========================================
  Files         180      180              
  Lines       41066    41110      +44     
==========================================
+ Hits        31153    31157       +4     
- Misses       8777     8816      +39     
- Partials     1136     1137       +1     

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