Fix misuse of omitempty in jsonschema

[xxx7xxxx]

Try to fix the massive misuse of omitempty in #884 . Now the fields without specifying omitempty would be required by default.

As for the required misuse, I don't think there is a simple and brute solution like emitempty. Since required needs to change the type to its pointer type, which would cause a lot of huge changes. Another way is to change the vendor to do it, which will bring more complexity. I suggest letting it be and changing it in the next development step by step.

[suchen-sci]

@xxx7xxxx looks good to me, just two little typo.

[codecov-commenter]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (4a57baf) 81.23% compared to head (ade9ffa) 81.23%.

Files	Patch %	Lines
pkg/v/v.go	55.55%	3 Missing and 1 partial ⚠️
pkg/v/validaterecorder.go	72.72%	1 Missing and 2 partials ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1136      +/-   ##
==========================================
- Coverage   81.23%   81.23%   -0.01%     
==========================================
  Files         148      148              
  Lines       16623    16618       -5     
==========================================
- Hits        13504    13499       -5     
+ Misses       2480     2479       -1     
- Partials      639      640       +1     

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