Implement setTimeout/clearTimeout in Maestro's JavaScript Environment

[JulienLeal]

Proposed changes

This PR implements the standard JavaScript timer functions (setTimeout/clearTimeout) in Maestro's GraalJS environment, which previously didn't include these functions.

Changes

GraalJsTimer.kt

• Implemented new GraalJsTimer class to handle JavaScript timer functionality
• Added thread-safe timer management using AtomicInteger
• Implemented proper timer tracking with CountDownLatch
• Added cleanup handling for timer resources

GraalJsEngine.kt

• Added timer bindings to the JavaScript context
• Exposed setTimeout and clearTimeout functions
• Added timer cleanup in engine close

Orchestra.kt

• Added support for waiting on active timers in script execution
• Improved script condition handling with proper null safety
• Added timer completion checks before finishing script execution

Implementation Details

The implementation follows JavaScript's standard timer behavior:

• setTimeout(callback, delay, ...args) returns a numeric timer ID
• clearTimeout(timeoutId) cancels a pending timeout
• Timer management is thread-safe and properly cleaned up
• Test execution waits for pending timeouts

Testing

Tested with various scenarios:

• Short and long timeouts
• Multiple concurrent timeouts
• Timer cancellation
• Resource cleanup