Subscribers are passed with the cloud event data in the form for string.

[Abhilash-Chandran]

Describe the bug
In the current form subscribe method under HttpServerPubsub passes the cloud event data to the callback as a string.

• A decision needs to be made whether this should be decoded into a CloudEvent object before passing it to the callback.

This needs to be done only if the rawEvents argument is set to false.

Sdk version & Dapr Version

Dapr 1.5

Expected behavior
This should be enhanced to pass the decoded cloud event to the callback.