Azure Functions documentation updates

[cgillum]

Several Azure Durable Functions articles need to be either written or updated with Java sample code and references.

New content

• [x] Java quickstart
• [x] Published JavaDocs under https://docs.microsoft.com/java/

Tutorials to update

• [ ] https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-sequence
• [ ] https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-cloud-backup
• [ ] https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-monitor-python (doc file should be renamed)
• [ ] https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-phone-verification
• [ ] https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-event-publishing

Conceptural content to update

• [x] https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-overview
• [x] https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-versions#javascript-python-and-powershell (just mention Java alongside the others that require the v2 extension support)
• [x] https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-orchestrations
• [x] https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-code-constraints
• [x] https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-sub-orchestrations
• [x] https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-custom-orchestration-status
• [x] https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-timers
• [x] https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-external-events
• [x] https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-error-handling
• [x] https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-eternal-orchestrations
• [x] https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-singletons
• [x] https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-http-features
• [x] https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-entities (mention it's not yet available for Java)
• [x] https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-task-hubs
• [x] https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-instance-management
• [x] https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-versioning (this currently only has C#, but we should consider adding Java as well)
• [x] https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-serialization-and-persistence
• [x] https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-diagnostics
• [x] https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-billing

Reference articles

• [x] https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-bindings
• [x] https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-unit-testing (currently C#-only)