feat: Android Gradle Plugin moved to separate directory

[ddolny]

This PR introduces the following:

• Ottrelite Gradle Plugin moved to separate directory
• Plugin published to the https://plugins.gradle.org/
• Modified example to use published plugin instead of the one from buildSrc

---

Note

Moves the Ottrelite Android Gradle plugin into a standalone, publishable module and updates the example to consume it; adds new Android APIs and renames traceCounter to counterEvent.

• Gradle Plugin (standalone):
  • New module plugin/ottrelite-gradle-plugin with Gradle wrapper, settings.gradle.kts, and publishing config for com.callstack.ottrelite (v0.1.0).
  • Refactor instrumentation: move ReplacementDescriptor to com.callstack.plugin.model and split ReplacementDescriptorList; update mapping (traceCounter -> counterEvent); simplify logging.
  • Extract OttreliteTracingExtension into its own file; minor cleanup in variant selection logic.
• Example App:
  • Remove android/buildSrc plugin; add classpath dependency com.callstack:ottrelite-plugin:0.1.0 in examples/rn-app/android/build.gradle.
• Core Android API (packages/core/android/.../OttreliteAndroid.kt):
  • Add beginAsyncEvent(eventName, argsMap) and beginEvent(sectionName, argsMap) overloads.
  • Rename traceCounter to counterEvent and add Double overload.

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Bug: Internal Kotlin Import Violates Best Practices

Unused import from internal Kotlin package. The import org.jetbrains.kotlin.gradle.internal.backend.common.serialization.metadata.DynamicTypeDeserializer.id is never used in the file and imports from internal APIs (indicated by .internal. in the path), which violates best practices and may cause compilation failures depending on the Kotlin/Gradle version and build configuration.