Don't use StringBuilder in getValidSsn since length could be predicted

[snuyanzin]

This allows to speed up the method in about 30-40%

[what-the-diff]

PR Summary

• Modification in ZhCnIdNumber.java File
  The java file for our Identification Number system underwent changes to improve its functionality and performance.

• Update in getValidSsn Method
  This change is about simplifying the method for creating a valid Social Security Number. Instead of using multiple variables and notably removing s, results are now stored and manipulated directly in the res array.

• Introducing New Location Setting
  The location variable loc has now been configured to select an option from a predefined list of locations. This change can lead to better accuracy and a wider range of options in our data.

• Major Updates in generateDay Method

  1. The generateDay method will now take an additional input parameter. This new parameter allows for easier manipulation of dates directly by altering the res array.
  2. The direct assignment of values to res is done instead of using a StringBuilder, streamlining the process to create and set date values.
  3. The method now correctly places year, month, and day values in the right positions within the res array. This feature significantly improves the clarity of the information provided.

• Changes in ID String Generation
  In previous versions, the tenth character in the ID string was manualy configured as 'X'. In this update, 'X' is directly assigned to the res array, simplifying the whole process. The final ID string is now directly returned from the res array, avoiding unnecessary conversions. This change can lead to more efficient ID generation.

[codecov-commenter]

Codecov Report

Merging #974 (7932c44) into main (b6822df) will increase coverage by 0.04%.
The diff coverage is 100.00%.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

@@             Coverage Diff              @@
##               main     #974      +/-   ##
============================================
+ Coverage     92.34%   92.38%   +0.04%     
- Complexity     2760     2761       +1     
============================================
  Files           289      289              
  Lines          5513     5518       +5     
  Branches        602      601       -1     
============================================
+ Hits           5091     5098       +7     
  Misses          268      268              
+ Partials        154      152       -2     

Files	Coverage Δ
...ain/java/net/datafaker/idnumbers/ZhCnIdNumber.java	90.56% <100.00%> (+3.06%)	⬆️

... and 1 file with indirect coverage changes

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[kingthorin]

Thanks!