sendTimeoutInSeconds for AwaitableSender should be settable for each send operation

[ramya-rao-a]

Currently sendTimeoutInSeconds is settable only when creating the awaitable sender, but is used in each send operation.

For consumers who want to lazily create the sender and then use it, this makes it hard to configure a timeout as they would want the timeout to span the link creation plus the actual send operation.

This issue is to allow configuring the sendTimeoutInSeconds for each send operation.

cc @amarzavery

[ramya-rao-a]

Turns out we can re-set this timeout by updating the property on the sender. We can consider closing this issue

[ramya-rao-a]

Version 1.1.0 is now released which allows configuring of the timeout in the send operation!