Add support for Azure OpenAI

[the-gigi]

This PR adds support to Azure OpenAI and addresses #3

There are 5 differences between OpenAI and Azure OpenAI. They are all addressed here and the code was tested against an Azure OpenAI deployment.

1. The base URL is different and unique to each deployment
2. The API key is passed in a header called api-key
3. The endpoints path don't include the /v1/ prefix that some OpenAI endpoints use
4. An API version query param must be added
5. The model is baked into each deployment and is not passed as part of the request

Here are the details of the PR:

• Bump celverclient to 1.0.0 (for URL interceptor)
• Add an optional urlInterceptor function
• Add header api-key: <API key>
• Fix some tests that broke due to cleverclient 1.0.0 removing HttpProcessor constructor (replace with builder)
• Add new AzureOpenAIChatServiceDemo
• Tested the demo against an Azure OpenAI deployment

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9ca56a2) 88.09% compared to head (7eaadac) 88.08%.

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Additional details and impacted files

@@             Coverage Diff              @@
##               main      #42      +/-   ##
============================================
- Coverage     88.09%   88.08%   -0.02%     
  Complexity      602      602              
============================================
  Files           105      105              
  Lines           941      940       -1     
  Branches         27       27              
============================================
- Hits            829      828       -1     
  Misses           69       69              
  Partials         43       43              

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[sashirestela]

@the-gigi Please, fix the observations