Apache HBase channel adapters & gateways support

[markusherbert]

Expected Behavior
There should be support for Reactive and non Reactive code (with .block()). HBase also mostly prefers bulk operations, therefore there should be native support for this (Reactively with .block()). Spring Hadoop (deprecated) should not get used - we should use HBase async client for this.

Current Behavior
No native support

Context
I try to map here all the most needed but missing components.
This old Spring support implementation probably can also help.