Add item writer for Redis

[fmbenhassine]

This issue is to add support to write data to Redis based on Spring Data Redis.

[santfirax]

Hello @benas, I would like to work on this. Any chance that you can provide some guidance ?

[fmbenhassine]

@santfirax Thank you for your offer to help! The writer could be based on KeyValueItemWriter for consistency with other key/value writers. For the reader, I need some time to reflect on the best way to read data from Redis (ie make the reader use a RedisTemplate or a Redis Repository). But I'm open to ideas, so you are welcome to open a PR and we can discuss it there.

[santfirax]

Hello @benas I've created a PR for the write using RedisTemplate. #3961. Any chance that you can take a look at it ?

[MinJunKweon]

Hello, @benas. I have an idea about RedisRepositoryItemReader / RedisRepositoryItemWriter. They are based on RedisRepository. So ItemReader can read data that saved by RedisRepository. And ItemWriter can write data through RedisRepository. I would like to open a PR for this. Is there anything I should know?

[seonWKim]

Hi, @fmbenhassine. I wonder if this issue is handled by anyone. If not, may I try on this issue?