Provide a reactive StringRedisTemplate [DATAREDIS-643]

[spring-projects-issues]

Mark Paluch opened DATAREDIS-643 and commented

Provide a reactive template API typed to String interaction, similar to StringRedisTemplate.

Motivation is driven by Spring Boot's configuration mechanism as it configures just a ReactiveRedisTemplate<Object, Object> bean while the majority of users uses ReactiveRedisTemplate<String, String>. Spring Boot requires a different type to make it happen

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Referenced from: pull request #288