feat: Centralize database connection settings and deprecate old parameters

[ogabrielluiz]

This pull request includes several changes to the DatabaseService and Settings classes to improve database connection handling and configuration. The main changes involve the introduction of new connection settings, deprecating old settings, and refactoring the code to use the new settings.

Database connection handling improvements:

• Added support for asynchronous SQlite connections by using AsyncAdaptedQueuePool(src/backend/base/langflow/services/database/service.py).
• Introduced the _build_connection_kwargs method to merge deprecated settings with new db_connection_settings and log warnings for deprecated settings (src/backend/base/langflow/services/database/service.py).
• Refactored the _create_engine method to use the new db_connection_settings and handle connection pool settings appropriately (src/backend/base/langflow/services/database/service.py).

Configuration updates:

• Deprecated pool_size and max_overflow settings in favor of db_connection_settings (src/backend/base/langflow/services/settings/base.py).
• Added db_connection_settings to the Settings class to consolidate common database connection settings (src/backend/base/langflow/services/settings/base.py).

[codspeed-hq]

CodSpeed Performance Report

Merging #5960 will improve performances by 54.9%

_{Comparing add-poll-config-to-db-service (71ad5ec) with main (3e2e2ce)}

Summary

⚡ 6 improvements
✅ 3 untouched benchmarks

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	test_build_flow_from_request_data	325.6 ms	289.4 ms	+12.51%
⚡	test_invalid_run_with_input_type_chat	27 ms	17.4 ms	+54.9%
⚡	test_successful_run_with_input_type_any	172.6 ms	145.8 ms	+18.36%
⚡	test_successful_run_with_input_type_text	163.9 ms	142.9 ms	+14.72%
⚡	test_successful_run_with_output_type_any	154.7 ms	132.7 ms	+16.62%
⚡	test_successful_run_with_output_type_debug	164.2 ms	142.7 ms	+15.07%

[cbornet]

NIT: could do

kwargs["poolclass"] = AsyncAdaptedQueuePool

and remove pool = None in the else branch.