feat: Support URL Parameters for OpenAI URLs

[oobug]

Description

Support the definition of URL parameters that will be added to OpenAI API calls. This is added to support the Azure OpenAI in Azure AI implementation.

Closes: #2

What change does this PR introduce?

Please select the relevant option(s).

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update (changes to docs/code comments)

What is the proposed approach?

Add a new parameter to the .env file: OPENAI_URL_PARAMS. This supports a JSON object, where the hard-coded keys & values will be used to create a query string appended to the OpenAI request URL.

Checklist:

• The commit message follows our adopted guidelines
• Testing has been done for the change(s) added (for bug fixes/features)
• Relevant comments/docs have been added/updated (for bug fixes/features)