feat: improve registry implementation

[sysulq]

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[codecov-commenter]

Codecov Report

Merging #482 (a7eff59) into master (3f036d0) will increase coverage by 0.07%.
The diff coverage is 52.63%.

@@            Coverage Diff             @@
##           master     #482      +/-   ##
==========================================
+ Coverage   40.80%   40.87%   +0.07%     
==========================================
  Files          89       89              
  Lines        5747     5759      +12     
==========================================
+ Hits         2345     2354       +9     
- Misses       3222     3225       +3     
  Partials      180      180              

Impacted Files	Coverage Δ
pkg/client/grpc/resolver/resolver.go	0.00% <0.00%> (ø)
pkg/util/xgo/init.go	9.67% <0.00%> (-0.33%)	⬇️
pkg/client/grpc/client.go	84.61% <100.00%> (+3.97%)	⬆️
pkg/client/grpc/config.go	25.64% <100.00%> (+0.96%)	⬆️

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