Add support for LPOS command [DATAREDIS-1196]

[spring-projects-issues]

Mark Paluch opened DATAREDIS-1196 and commented

See also https://redis.io/commands/lpos

We should also update DefaultRedisList to enable indexOf and lastIndexOf.

Command is available since Redis 6.0.6

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Issue Links:

• DATAREDIS-1215 Upgrade to Lettuce 6.0-RC2
  ("depends on")

Referenced from: pull request #563