Added support for Lettuce reactive Redis commands

[wuwen5]

• If this pull request closes/resolves/fixes an existing issue, replace the issue number. Closes #.
• Update the CHANGES log.

Resolves apache/skywalking#12817

[wu-sheng]

I am not sure whethere there is some issues in e2e. Many fails, but seem irrelevant.

[wu-sheng]

I fixed the test framework via recent release PR(#791). Although two rocketmq cases have to been removed as it can't pass in CI in anyway, can't find out a clue.

Once I get that PR merged, I could update here, and your case should be able to run again.

[wu-sheng]

Resolve conflicts as I put 9.7 out, and have fixed all things.

[wu-sheng]

supported-framework doc should be updated as well, and supported versions should be in changes as well.

[wu-sheng]

A key question is as following, we should consider this case. I think user could use like this, right?
Reactor-only context source: The snapshot is extracted via SKYWALKING_CONTEXT_SNAPSHOT from Reactor Context, which is only set by the spring-webflux plugin. If someone uses
Lettuce reactive without Spring WebFlux (e.g., standalone Reactor app), no context propagation occurs.

[wuwen5]

supported-framework doc should be updated as well, and supported versions should be in changes as well.

This PR does not change the supported version ranges of any frameworks