Build and bundle gemstone locally instead of prebuilt package

[0xh3rman]

No description provided.

[gemini-code-assist]

Summary of Changes

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This pull request significantly refactors the build process for the gemstone library, transitioning from consuming it as a prebuilt external dependency to building it directly within the project. This change integrates the gemstone module as a local project, enabling local compilation of its native components and Kotlin bindings, which should provide more granular control over the build process, simplify development, and potentially enhance debugging capabilities.

Highlights

• Local Gemstone Build: The gemstone library is now built and bundled locally as a project dependency instead of being consumed as a prebuilt package, allowing for greater control over its compilation and integration.
• New Gemstone Project Module: A new Gradle module (gemstone) has been introduced to manage the build process for the gemstone Android library, encompassing native code compilation via cargo-ndk and Kotlin binding generation using uniffi.
• Submodule Update: The core submodule reference has been updated, likely to align with the new local gemstone build process or to incorporate other related upstream changes.

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[gemini-code-assist]

Code Review

This pull request integrates a new gemstone Android library module into the project. This involves updating the core subproject, adding the gemstone/build.gradle.kts file, modifying gemcore to depend on the new internal project, and updating gradle/libs.versions.toml and settings.gradle.kts to reflect these changes. The review highlights several areas for improvement in the new gemstone module's Gradle configuration, including refactoring task dependencies to avoid afterEvaluate, aligning the compileSdk to a stable version, enabling minification for release builds, and ensuring consistent Java and JVM target versions (Java 17) across modules, specifically with gemcore.