feat: add NestedDictInput filter and non-vector search for AstraVectorStoreComponent

[mieslep]

This pull request introduces several enhancements and refactorings to the AstraDB vector store component. The most significant changes include the introduction of a new NestedDictInput for advanced search filters, improvements to how search arguments are built, and better error handling during the search process.

Enhancements to search filters and arguments:

• Introduced NestedDictInput for advanced_search_filter and deprecated the existing search_filter (src/backend/base/langflow/components/vectorstores/astradb.py).
• Enhanced _build_search_args method to clean and validate search filters, and to log deprecated usage of search_filter (src/backend/base/langflow/components/vectorstores/astradb.py).

Error handling and logging improvements:

• Improved error handling in search_documents method by adding specific error messages and logging steps (src/backend/base/langflow/components/vectorstores/astradb.py).

Codebase improvements:

• Added a cached vector store attribute _cached_vector_store to AstraVectorStoreComponent (src/backend/base/langflow/components/vectorstores/astradb.py).
• Updated import statements to include AstraDBVectorStore and NestedDictInput (src/backend/base/langflow/components/vectorstores/astradb.py).

[codspeed-hq]

CodSpeed Performance Report

Merging #4564 will degrade performances by 38.01%

_{Comparing mieslep:phil/astra-metadata-component (5fc6db5) with main (563b90e)}

Summary

⚡ 1 improvements
❌ 1 regressions
✅ 13 untouched benchmarks

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

Benchmarks breakdown

	Benchmark	main	mieslep:phil/astra-metadata-component	Change
❌	test_successful_run_with_input_type_text	127.5 ms	205.7 ms	-38.01%
⚡	test_successful_run_with_output_type_debug	206 ms	126.8 ms	+62.44%

[erichare]

One small param issue (possibly)