fix: Add session_id and graph parameters to flow execution functions and update graph init in Flow as Tool

[ogabrielluiz]

This pull request enhances the FlowTool and related components by introducing session_id and graph parameters to flow execution functions. The changes improve the context management during graph creation and execution, allowing for better tracking of user sessions and flow states. Additionally, the graph initialization logic has been updated to accommodate these new parameters, ensuring a more robust and flexible flow execution process.

[codspeed-hq]

CodSpeed Performance Report

Merging #4558 will degrade performances by 20.67%

_{Comparing flow-as-tool-fix (78453dc) with main (f1fd5be)}

Summary

⚡ 1 improvements
❌ 2 regressions
✅ 12 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	flow-as-tool-fix	Change
❌	test_invalid_run_with_input_type_chat	13.6 ms	15.1 ms	-10.01%
⚡	test_successful_run_with_input_type_any	205 ms	129.5 ms	+58.27%
❌	test_successful_run_with_output_type_any	162.3 ms	204.6 ms	-20.67%