Add trace support for simple apis in async client

The asynchronous hbase client framework (HBASE-16833) was added in HBase 2.0 and doesn't have HTrace traces. Let's add the OpenTracing traces as part of the OT migration project.

===== Update =====
Use OpenTelemetry to implement tracing in async client. And first we will implement tracing for simple APIs, such as get, put and so on. Will file a separated issue to implement trace support for scan related API as it much more complicated.