[Fix] koin core coroutines loading in background

[arnaudgiuliani]

---

Optimize Lazy Modules Loading with Parallel Initialization

Summary

This PR significantly improves Koin startup performance by enabling true parallel loading of lazy modules. Previously, lazy modules were loaded sequentially within a single coroutine, defeating the purpose of lazy loading. Now each lazy module loads in its own coroutine job, allowing concurrent
initialization.

This approach:

• Blocked lazy modules from loading concurrently
• Caused startup time to scale linearly with module count
• Undermined the performance benefits of lazy loading

Solution

Core Fix (KoinApplicationLazyExt.kt:52-56)

Each lazy module now launches in a separate coroutine job, enabling true parallel initialization.

Added Multiplatform runBlocking Support (KoinPlatformCoroutinesTools):

• Added runBlockingOnPlatform() to enable blocking waits on JVM & Native
• Moved waitAllStartJobs() from JVM-only to common code
• JS platform throws clear error directing users to use awaitAllStartJobs() instead

Key Changes

Performance Optimization:

• core/koin-core-coroutines/src/commonMain/kotlin/org/koin/core/KoinApplicationLazyExt.kt - Parallel loading implementation
• Each lazy module gets its own coroutine job for concurrent initialization

Multiplatform Support:

• KoinPlatformCoroutinesTools - Added runBlockingOnPlatform() for JVM/Native
• KoinWaitExt.kt → KoinWaitExt.jvm.kt + new common KoinWaitExt.kt
• waitAllStartJobs() now available on all platforms (JVM/Native block, JS throws error)

Benchmarks & Testing:

• Added lazy_modules_400.kt - 400-definition lazy module for stress testing
• Added HeavyStartupBenchmark.kt - Benchmarks comparing regular vs lazy modules (1, 100, 1000 modules)
• Updated existing benchmarks to test lazy module scenarios