chore: Update Gradle and Dokka, docs updates

[redaranj]

Changes in this pull request

Update Gradle to v9, Dokka to v2, associated docs updates.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• All applicable changes have been documented
• Any TO DO items (or similar) have been entered as GitHub issues and the link to that issue has been included in a comment

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.67%. Comparing base (99a0445) to head (c41af64).

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #74      +/-   ##
============================================
+ Coverage     69.81%   71.67%   +1.86%     
- Complexity       39      256     +217     
============================================
  Files            58       58              
  Lines          2193     2161      -32     
  Branches        250      228      -22     
============================================
+ Hits           1531     1549      +18     
+ Misses          504      482      -22     
+ Partials        158      130      -28     

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