v0.10.0 - Standard/FIFO Queue Modes with Race Condition Fix

Summary

• Refactored queue architecture into separate Standard and FIFO implementations
• Implemented race condition fix for FIFO queues with post-lock verification
• Added comprehensive test suite including race condition tests, benchmarks, and simulations
• Updated Makefile with separate test (unit only) and test-ci (integration) targets
• Removed runtime-alterable SetRandomDigits - now constructor-only with minimum 8 digits
• Fixed test infrastructure with proper container cleanup and DB readiness checks

Breaking Changes

• SetRandomDigits() method removed from Queue interface - random digits are now set at construction time only (minimum 8 digits enforced)

New Features

• FIFO Queue: New QueueFIFO type with strict ordering per message group and exactly-once delivery per group
• Standard Queue: Renamed from original implementation, best-effort FIFO with high throughput
• Factory Functions: New() and NewWithClient() for easy queue creation

Test Infrastructure

• make test - Run unit tests only (no Docker required)
• make test-ci - Run all tests including integration (requires Docker)
• make benchmark - Run benchmarks with memory, CPU profiling, and race detection