feat: add eppo-kotlin module setup (PR 0)

[typotter]

Summary

Initialize the eppo-kotlin module with build infrastructure. This PR sets up an empty module that compiles but contains no business logic.

Changes

• Add eppo-kotlin module to settings.gradle
• Configure build.gradle.kts with all dependencies:
  • kotlinx.serialization for type-safe JSON
  • kotlinx.coroutines for async operations
  • OkHttp for HTTP client
  • DataStore for persistence
  • sdk-common-jvm for shared types (VariationType, AssignmentLogger, etc.)
• Add Spotless for code formatting
• Configure ProGuard consumer rules
• Set namespace: cloud.eppo.kotlin
• Set Min SDK: 26, Target SDK: 34

Build Verification

./gradlew :eppo-kotlin:assemble
# BUILD SUCCESSFUL ✅

Module Structure

eppo-kotlin/
├── build.gradle.kts        # Build configuration
├── consumer-rules.pro      # ProGuard rules for consumers
├── proguard-rules.pro      # Module ProGuard rules
├── .gitignore
└── src/
    ├── main/kotlin/cloud/eppo/kotlin/    # (empty)
    └── test/kotlin/cloud/eppo/kotlin/    # (empty)

Dependencies

• Kotlin: 1.9.20 with coroutines (1.7.3)
• Serialization: kotlinx.serialization-json (1.6.0)
• Network: OkHttp (4.12.0)
• Storage: DataStore Preferences (1.1.1)
• Shared: cloud.eppo:sdk-common-jvm (3.13.1)
• Testing: JUnit, MockK, Truth, MockWebServer, Robolectric

Next PR

PR 1 will add the foundation layer (data objects, storage, network).

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