`ActiveSupport::Cache` integration does not support multiple cache backends

[naveg]

Current behaviour If redis-activesupport is present, then only ActiveSupport::Cache::RedisStore is patched (for methods that it has), and ActiveSupport::Cache::Store is not patched.

https://github.com/DataDog/dd-trace-rb/blob/210ed96858ff889a6d69339ba6fb112d7c68b621/lib/datadog/tracing/contrib/active_support/cache/redis.rb#L25-L38

Expected behaviour ActiveSupport::Cache::Store is always patched, because it may be used with cache backends other than redis.

Steps to reproduce

• Create an application with with redis-activesupport present
• Create a cache using a non-redis backend (eg ActiveSupport::Cache::MemCacheStore)
• Note that cache writes are not instrumented (because we didn't patch the :write method of ActiveSupport::Cache::Store)

One solution could be to patch multiple classes - ie if redis is present and defines the method, patch both classes, rather than one or the other.

Environment

• ddtrace version: 1.12
• Configuration block (Datadog.configure ...):
• Ruby version: 3.0.6
• Operating system: Linux
• Relevant library versions: