refactor: Simplify selection of Azure vs OpenAI invocation layers

[vblagoje]

What?

This PR introduces a refactoring change that removes the dependency on Azure layers check within the PromptModel (see loc 90-95). As part of this change, we have added a utility function has_azure_parameters which simplifies the logic of selecting the right invocation layer between Azure and OpenAI:

def has_azure_parameters(**kwargs) -> bool:
    azure_params = ["azure_base_url", "azure_deployment_name"]
    return any(kwargs.get(param) for param in azure_params)

Why?

Currently, a small kludge in the PromptModel checks for the presence of Azure layers. However, PromptModel should not know specific implementation details related to Azure layers. This change relies on the existing logic from the supports method to select the right invocation layer and ensures a cleaner separation of responsibilities.

How can it be used?

This is an internal change and does not affect any public APIs. Therefore, everything will function as before from the user's perspective. The utility function we added streamlines the internal selection process between Azure and OpenAI invocation layers.

How did you test it?

We have strengthened our test coverage by adding an integration test. This new test uses PromptNode with Azure and OpenAI model parameters and checks for the right invocation layer selection.

Notes for the reviewer

This change should not affect functionality from a user's perspective.
Your feedback or suggestions are welcome.

[coveralls]

Pull Request Test Coverage Report for Build 5462308609

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 109 unchanged lines in 7 files lost coverage.
• Overall coverage decreased (-0.03%) to 43.913%

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Files with Coverage Reduction	New Missed Lines	%
nodes/prompt/invocation_layer/azure_chatgpt.py	2	89.47%
nodes/prompt/invocation_layer/azure_open_ai.py	2	89.47%
document_stores/search_engine.py	4	62.39%
nodes/prompt/invocation_layer/chatgpt.py	7	75.0%
nodes/prompt/prompt_model.py	7	86.0%
nodes/prompt/invocation_layer/open_ai.py	8	80.0%
document_stores/elasticsearch/es8.py	79	0%

Totals
Change from base Build 5453787062:	-0.03%
Covered Lines:	10107
Relevant Lines:	23016

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💛 - Coveralls

[julian-risch]

LGTM! Good refactoring! 👍