Expose the validator service itself.

[maliming]

Resolve #17596

[codecov]

Codecov Report

Merging #17672 (b5afc77) into dev (6356592) will decrease coverage by 0.03%.
Report is 20 commits behind head on dev.
The diff coverage is 20.00%.

@@            Coverage Diff             @@
##              dev   #17672      +/-   ##
==========================================
- Coverage   53.53%   53.51%   -0.03%     
==========================================
  Files        3036     3036              
  Lines       94853    94857       +4     
==========================================
- Hits        50780    50758      -22     
- Misses      44073    44099      +26     

Files Changed	Coverage Δ
...olo/Abp/Cli/Commands/ProjectCreationCommandBase.cs	5.49% <0.00%> (-0.04%)	⬇️
...p/Cli/ServiceProxying/ServiceProxyGeneratorBase.cs	0.00% <0.00%> (ø)
...dation/AbpFluentValidationConventionalRegistrar.cs	91.30% <100.00%> (+0.39%)	⬆️

... and 3 files with indirect coverage changes

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