Console & ZIO support

🚀 Features

• Add console implementation with plaintext and json format support
• Add ZIO specific context propagation support
• Introduced shared module that simplifies custom implementations.
• Simplified slf4j initialization.
• Add noop implementations.

🧰 Maintenance

• Generally improved build & ci.
• Update cats-effect to 2.1.1 @scala-steward (#44)
• Update circe-core, circe-literal, ... to 0.13.0 @scala-steward (#49)
• Update diffx-scalatest to 0.3.17 @scala-steward (#41)
• Update sbt to 1.3.8 @scala-steward (#40)
• Update sbt-ci-release to 1.5.2 @scala-steward (#45)
• Update sbt-microsites to 1.1.2 @scala-steward (#54)
• Update sbt-scalafmt to 2.3.1 @scala-steward (#37)
• Update sbt-unidoc to 0.4.3 @scala-steward (#36)
• Update scala-collection-compat to 2.1.4 @scala-steward (#46)
• Update scalatest to 3.1.1 @scala-steward (#53)
• Update sourcecode to 0.2.1 @scala-steward (#43)