Integrates sbt-org-policies plugin

[juanpedromoreno]

This PR migrates from sbt-catalyst-extras to sbt-org-policies plugin, upgrading all the dependencies.

It also:

• Migrates the http4s-scalaz example to http4s-fs2-cats.
• Fixes Updated to Monix 2.2.3 #112 .
• Provides some scalafmt format changes.
• Updates the license headers.

Please, @raulraja @dialelo @peterneyens could you review? Thanks!

[codecov-io]

Codecov Report

Merging #115 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #115   +/-   ##
=======================================
  Coverage   77.59%   77.59%           
=======================================
  Files          10       10           
  Lines         250      250           
  Branches        2        2           
=======================================
  Hits          194      194           
  Misses         56       56

Impacted Files	Coverage Δ
shared/src/main/scala/datasource.scala	66.66% <ø> (ø)	⬆️
shared/src/main/scala/syntax.scala	66.66% <ø> (ø)	⬆️
shared/src/main/scala/implicits.scala	100% <ø> (ø)	⬆️
shared/src/main/scala/cache.scala	91.66% <ø> (ø)	⬆️
shared/src/main/scala/fetch.scala	80% <ø> (ø)	⬆️
jvm/src/main/scala/unsafeImplicits.scala	0% <ø> (ø)	⬆️
shared/src/main/scala/FetchMonadError.scala	100% <ø> (ø)	⬆️
shared/src/main/scala/env.scala	50% <ø> (ø)	⬆️
shared/src/main/scala/interpreters.scala	93.93% <ø> (ø)	⬆️
shared/src/main/scala/freeinspect.scala	72.72% <ø> (ø)	⬆️

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