[Event Hubs] Port bug fixes from Service Bus

[ramya-rao-a]

Event Hubs and Service Bus use similar design patterns and therefore a fix made in one usually has the potential to be a candidate in the other.

This issue is to review the bug fixes that have gone in Service Bus till this point and track and the port the ones that are applicable to Event Hubs.

• First add the list of candidates in this issue
• Once the list is reviewed and approved, port over the changes

[ramya-rao-a]

Below are list of improvements that were done in Service Bus and should be ported to Event Hubs and don't have issues to track them

• constants pacakge info should come from json like we did in [Service Bus] Update version number in constants #2164
• Combine ClientOptionsBase and ClientOptions like we did in [Service Bus] Improve Namespace creation experience #1422 (Created new issue [Event Hubs] Consider combining ClientOptionsBase and ClientOptions #2920)

Improvements to receive operations:

• Check if link exists before using them like in [Service Bus] Check if link exists before using them #2314
• Errors from message handler should surface up like in [Service Bus] Error from message handler should surface up #1233

[ShivangiReja]

Close with #2894, #2900, #2902, #2923