Add concurrent workflow execution capabilities

[nassor]

This PR introduces concurrent workflow execution functionality to Cano, allowing multiple workflow instances to run in parallel with configurable completion strategies. Key additions include:

• New ConcurrentWorkflow type with flexible timeout strategies (WaitForever, WaitForQuota, WaitDuration, WaitQuotaOrDuration)
• Enhanced monitoring with detailed status tracking for concurrent executions
• Simplified scheduler API with cleaner workflow registration
• New examples demonstrating concurrent workflows and SIMD matrix processing pipeline
• Updated benchmarks for performance testing of concurrent vs sequential execution
• Dependency updates, including tokio version bump

[Copilot]

Pull Request Overview

This PR introduces concurrent workflow execution capabilities to Cano, allowing multiple workflow instances to run in parallel with configurable completion strategies. The implementation enhances the scheduler with support for both regular and concurrent workflows while maintaining API consistency.

Key Changes

• Added ConcurrentWorkflow type with flexible timeout strategies (WaitForever, WaitForQuota, WaitDuration, WaitQuotaOrDuration)
• Enhanced the scheduler to support both regular and concurrent workflows with detailed status tracking
• Added comprehensive examples demonstrating concurrent workflows and SIMD matrix processing pipelines

Reviewed Changes

Copilot reviewed 16 out of 19 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/workflow.rs	Adds concurrent workflow types, wait strategies, status tracking, and execution logic
src/scheduler.rs	Enhances scheduler to support concurrent workflows alongside regular ones
src/lib.rs	Updates public API exports to include concurrent workflow types
examples/workflow_*.rs	Removes redundant type annotations following type inference improvements
examples/workflow_concurrent.rs	New example demonstrating concurrent workflow execution patterns
examples/workflow_simd_matrix_pipeline.rs	New SIMD-accelerated matrix processing pipeline example
examples/scheduler_*.rs	Updated examples showcasing mixed workflow types and scheduling patterns
benches/workflow_performance.rs	Enhanced benchmarks for concurrent vs sequential execution performance testing

Comments suppressed due to low confidence (1)

src/scheduler.rs:613

• The comment mentions handling tasks that were still running, but the implementation simply marks all workflows as cancelled. The comment should be updated to accurately reflect the current behavior or the implementation should be improved to handle running tasks properly.

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[Copilot]

[nitpick] The WaitForever strategy has duplicated error handling logic for task join errors. Consider extracting this into a helper function to reduce code duplication across all wait strategies.