feat: Update model_input_constants to add SambaNovaComponent

[edwinjosechittilappilly]

Add sambanova to models in agents.

This pull request includes changes to integrate SambaNova as a new model component in the backend. The most important changes include importing the SambaNova component, defining a function to get SambaNova inputs and fields, and updating the model providers dictionary to include SambaNova.

Integration of SambaNova component:

• src/backend/base/langflow/base/models/model_input_constants.py: Imported SambaNovaComponent from langflow.components.models.sambanova.
• src/backend/base/langflow/base/models/model_input_constants.py: Added a new function _get_sambanova_inputs_and_fields() to handle SambaNova inputs and fields.
• src/backend/base/langflow/base/models/model_input_constants.py: Updated the model providers dictionary to include SambaNova inputs and fields, and handle potential import errors.

[codspeed-hq]

CodSpeed Performance Report

Merging #5368 will degrade performances by 61.01%

_{Comparing feat-add-sambanova-to-agents (5b53e61) with main (e657e9d)}

Summary

❌ 3 regressions
✅ 12 untouched benchmarks

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

Benchmarks breakdown

	Benchmark	main	feat-add-sambanova-to-agents	Change
❌	test_get_and_cache_all_types_dict	1 ms	2.6 ms	-61.01%
❌	test_setup_llm_caching	1.2 ms	2.1 ms	-43.3%
❌	test_successful_run_with_input_type_text	258.4 ms	323.7 ms	-20.2%