Upgrade codebase to Java 17+: Switch to records, use ZonedDateTime, Nullable annotations

[sdstoehr]

Upgrade codebase to Java 17+

• Use records
• Use ZonedDateTime rather than Date
• Annotate fields with @Nullable/@Nonnull

Important

These changes imply several breaking changes, please test your code base thoroughly.

• Getters are now named .property() rather than .getProperty()
• We are now using ZonedDateTime (which supports higher precision) rather than outdated Date class
• The enums HttpStatus and HttpMethod are now only used optionally. int status() is now returning the status code as it was in the har file (previously it returned 0 for unknown status codes). String method() is now also returning the http method as it was in the har file. The enums are now available as .httpStatus() and .httpMethod()

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.14%. Comparing base (fcdb942) to head (cd39e90).
Report is 3 commits behind head on release/3.0.

Additional details and impacted files

@@                Coverage Diff                 @@
##             release/3.0     #188       +/-   ##
==================================================
+ Coverage          79.47%   98.14%   +18.67%     
+ Complexity           401      141      -260     
==================================================
  Files                 27       27               
  Lines                726      324      -402     
  Branches             131       48       -83     
==================================================
- Hits                 577      318      -259     
+ Misses               149        6      -143     

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