Refactor settings management

[ciprianjichici]

Refactor settings management

The issue or feature being addressed

Align the management of settings with the new AIModel and APIEndpoints resources.
Have a single source of the truth for configuration between development and infrastructure.

Details on the issue fix or feature implementation

N/A

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• I have included unit tests for the issue/feature
• I have included inline docs for my changes, where applicable
• I have successfully run a local build
• I have provided the required update scripts, where applicable
• I have updated relevant docs, where applicable

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[hatboyzero]

DataSourceHub API is still looking for the following config setting:

FoundationaLLM:APIs:DataSourceHubAPI:AppInsightsConnectionString

[hatboyzero]

LangChainAPI is still looking for the following config setting:

FoundationaLLM:APIs:LangChainAPI:AppInsightsConnectionString

[hatboyzero]

PromptHub API is still looking for the following config setting:

FoundationaLLM:APIs:PromptHubAPI:AppInsightsConnectionString

[hatboyzero]

Services are crashing on invalid storage account names and invalid AppInsights connection strings. I suspect that some of the settings still do not match up with what is expected.