Interop support for SLF4J -> Telemere.
Telemere will attempt to load this ns automatically when possible.

To use Telemere as your SLF4J backend/provider, just include the
`com.taoensso/telemere-slf4j` dependency on your classpath.

Implementation details,
Ref. <https://www.slf4j.org/faq.html#slf4j_compatible>:

  - Libs  must include `org.slf4j/slf4j-api` dependency, but NO backend.

  - Users must include a single backend dependency of their choice
    (e.g. `com.taoensso/telemere-slf4j` or `org.slf4j/slf4j-simple`).

  - SLF4J uses standard `ServiceLoader` mechanism to find its logging backend,
    searches for `SLF4JServiceProvider` provider on classpath.