feat: Update Project

[jlewis23]

🔧 Key Changes

✅ AWS SDK v2 Migration

• Replaced AWS SDK v1 (com.amazonaws.) with AWS SDK v2 (software.amazon.awssdk.)
• Updated:
  • MetricDatum, Dimension, StatisticSet
  • Removed .withX(...) mutators → replaced with immutable builders
• Switched to CloudWatchClient (sync) instead of async v1 client

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✅ Dropwizard Metrics 5 Upgrade

• Migrated from com.codahale.metrics → io.dropwizard.metrics5
• Updated:
  • MetricRegistry
  • ScheduledReporter signatures
  • MetricName usage instead of String
• Fixed Gauge registration (registerGauge(...))

⸻

✅ CloudWatch Reporter Refactor

• Rewrote CloudWatchReporter:
  • Updated report(...) method signature for Metrics 5
  • Removed deprecated async CloudWatch calls
  • Implemented batching with PutMetricDataRequest
  • Ensured immutability via .toBuilder()

⸻

✅ Test Suite Fixes

• Updated tests for:
  • AWS SDK v2 builders
  • Metrics 5 APIs
  • JUnit Jupiter migration
• Fixed mocking issues with AWS SDK v2 final classes

⸻

✅ Gradle / Build Updates

• Java 21 toolchain enabled
• Publishing configured for GitHub Packages (in-progress)
• Spotless formatting applied
• Dependency cleanup (removed legacy libs)

⸻

⚠️ Breaking Changes

• Requires:
  • Java 11+ (Gradle runtime)
  • AWS SDK v2 consumers
• API changes due to:
  • Metrics 5 upgrade

⸻

🧪 Testing

• All unit and integration tests updated and passing
• Verified CloudWatch metric publishing flow