Update ChatBot to work with dotnet-isolated and remove durable dependency

[aishwaryabh]

Resolves issue: https://github.com/Azure/azure-functions-pyfx-planning/issues/141

This PR removes the durable dependency in the chat bot as that was causing issues in the compatibility with dotnet-isolated since durable can't run a built in function that is technically OOP in in-proc mode. We decided to replace durable with table storage, in which the ChatBotStateEntity stores the state of the chatbot and the ChatMessageTableEntity represents each message that the chat bot processes. Each entity has the partition key being the id of the chat bot and the rowkey is called ChatMessage + index number of that message.

The table storage is configured by the user by adding the following in the host.json:

"extensions": {
    "openai": {
      "StorageConnectionName": "AzureWebJobsStorage",
      "CollectionName": "ChatBotRequests"
    }
  }

StorageConnectionName can be any connection string of a storage account and CollectionName is the name of the table that would hold the chat bot state and messages.

Here is an example of what the azure storage table will look like:

ChatBotState represents the state of the chatbot, and the corresponding messages are all of type ChatMessageEntity which contains each user that is relayed to and by the chatbot.

[manvkaur]

take latest of main and merge to your current branch, should have some conflicts and would require some changes

[cgillum]

Initial feedback on the samples and worker extension changes. Haven't looked at the WebJobs changes yet.

[cgillum]

Added more feedback, this time including the table storage implementation.

[cgillum]

More comments, this time a bit more skewed towards code style and organization. We to make sure the changes in your PR are consistent with the rest of the code in this repo.

[cgillum]

A few more comments, mostly around code style but a few around proper API usage, and one about potential issues with batch transaction sizes. I think we're nearly done!

[manvkaur]

some changes in https://github.com/Azure/azure-functions-openai-extension/blob/main/build/build-release.yml to publish worker nupkg as well can be done once worker reference is updated
Update below lines to include Worker package

Line 54 - Pattern: WebJobs.Extensions.OpenAI*.dll
Line 91 - projects: src//WebJobs.Extensions.OpenAI.csproj
Line 98 - Pattern: 'Microsoft.Azure.WebJobs.Extensions.OpenAI*.nupkg'

The attached build should produce 3 nupkg in artifacts

[cgillum]

Just a few additional tiny suggestions plus one small question, but all blockers are resolved so I'm signing off. :)

[manvkaur]

approving the PR, no blocking comment, check the build issues