databases/redisjson86: New port

RedisJSON is a Redis module that implements ECMA-404 The JSON Data
Interchange Standard as a native data type. It allows storing,
updating and fetching JSON values from Redis keys (documents).

Primary features:

• Full support of the JSON standard
• JSONPath-like syntax for selecting elements inside documents
• Documents are stored as binary data in a tree structure, allowing fast access to sub-elements
• Typed atomic operations for all JSON values types

WWW: https://oss.redislabs.com/redisjson/

This is the 8.6.X version of redisjson added as a new port in
preparation for upgrading the main ports to 8.8.X