Configuration to safely ignore null values in redis-cache

[anadinema]

Description

As redis does not support caching null values, currently in the implementation of redis-cache a check is there to throw a exception if the value is null. However, there can be a configuration to safely ignore the null value instead of throwing exception or trying to store it.

Same was discussed in #39547, hence creating this issue to have a configuration parameter which can achieve this behavior of safely ignoring null values instead of trying to save it in cache or throwing exception.

Implementation ideas

A parameter like cacheInfo.ignoreNullValues before the block where the exception is thrown

[quarkus-bot[bot]]

/cc @Ladicek (redis), @cescoffier (redis), @gwenneg (cache), @machi1990 (redis), @radcortez (config)

[anadinema]

@cescoffier, I have tried to do the implementation, https://github.com/quarkusio/quarkus/pull/42189

Please check, and let me know.

[cescoffier]

Started a discussion about null value in cache: https://github.com/quarkusio/quarkus/discussions/42940