Add Redis Commands as (HTTP API) Query Language

[gramian]

Since ArcadeDB supports the Redis API, Redis commands could also be supported as query language.
Based on the Redis implementation via jedis:

https://github.com/ArcadeData/arcadedb/blob/60d5e53654cd9154182a951c0af20b7467b0f748/redisw/src/main/java/com/arcadedb/redis/RedisNetworkExecutor.java

the currently available Redis commands should be made accessible as query language.

(originally proposed in Discord)

[gramian]

Some notes:

• Permanent commands first
• Currently supported: HDEL, HEXISTS, HGET, HMGET, HSET, PING
• Candidate commands: DBSIZE

[lvca]

I think it should be pretty easy to do like we supported MongoDB if the plugin is available at run-time.