[Java] Release Event Hubs Track 2 Library Preview 1

[AlexGhiondea]

Deliverable

https://aka.ms/azure-sdk-preview1-java

Goal

Release Preview for Track 2 of Event Hub

See if we can re-use underlying components of the existing Event Hubs library with modifications to the public surface
area to align with our current design docs.

Work Items

Track 2 Guideline Requirements

• [Event Hubs] Solidify API surface area and scenarios that are covered #3582: Solidify API surface area and scenarios that are covered
• [Event Hubs] Update APIs to support pagination if possible. #3535: Update APIs to support pagination if possible.
• [Event Hubs] Use new Authentication model #3579: Use new Authentication model
• [Event Hubs] Map thrown exceptions to ones used in exception hierarchy #3532: Map thrown exceptions to ones used in exception hierarchy
• [Event Hubs] Integrate RetryPolicy into EventHubsClient #3533: Add support for retry policy
• [Event Hubs] Verify telemetry information meets guidelines #3530: Verify telemetry information meets guidelines
• [Event Hubs] Update Cancellation Token or Timeout #3534: Update Cancellation Token or Timeout
• [Event Hubs] Update namespace #3581: Update namespace
• [Event Hubs] Update logging to match design spec. #3531: Update logging to match design spec.
• [Event Hubs] Explore support for tracing #3536: Explore support for tracing

Features

• [Event Hubs] Create EventSender #3598: Create EventSender
• [Event Hubs] Create underlying proton-j layer with Reactor #3599: Create underlying proton-j layer with Reactor
• [Event Hubs] Create Link, Session, and Connection with Reactor #3600: Create Link, Session, and Connection with Reactor
• [Event Hubs] Create EventReceiver #3601: Create EventReceiver
• [Event Hubs] Create Unit tests for exception classes #3714: Create Unit tests for exception classes
• [Event Hubs] Create Unit tests for EventReceiver #3715: Create Unit tests for EventReceiver
• [Event Hubs] Create Unit tests for EventSender #3716: Create Unit tests for EventSender
• [Event Hubs] Create unit tests for EventHubClient #3717: Create Unit tests for EventHubClient
• [Event Hubs] Ensure Proxy support aligns with Track 2 guidelines #3580: Ensure Proxy support aligns with Track 2 guidelines

Documentation and Samples Readiness

• [Event Hubs] Update javadoc #3578: Update javadoc
• [Event Hubs] Adapt existing or write new README #3538: Adapt existing or write new README
• [Event Hubs] Add samples #3537: Add samples