Revert "Delete deprecated rendering class (#2261)" (#2263)

This reverts commit 8b0305f.

build.sbt

@@ -774,10 +774,7 @@ lazy val enableMimaSettingsJVM =
   Def.settings(
     mimaFailOnProblem     := enforceMimaCompatibility,
     mimaPreviousArtifacts := previousStableVersion.value.map(organization.value %% moduleName.value % _).toSet,
-    mimaBinaryIssueFilters ++= Seq(
-      ProblemFilters.exclude[MissingClassProblem]("caliban.Rendering"),
-      ProblemFilters.exclude[MissingClassProblem]("caliban.Rendering$")
-    )
+    mimaBinaryIssueFilters ++= Seq()
   )
 
 lazy val enableMimaSettingsJS =

core/src/main/scala/caliban/Rendering.scala

@@ -0,0 +1,38 @@
+package caliban
+
+import caliban.introspection.adt._
+import caliban.introspection.adt.__TypeKind._
+import caliban.parsing.adt.Directive
+import caliban.rendering.DocumentRenderer
+
+@deprecated("Prefer the methods in caliban.rendering.DocumentRenderer instead.", "2.3.1")
+object Rendering {
+
+  /**
+   * Returns a string that renders the provided types into the GraphQL format.
+   */
+  @deprecated("Prefer DocumentRenderer.render() to render a Document.", "2.3.1")
+  def renderTypes(types: List[__Type]): String =
+    DocumentRenderer.typesRenderer.render(types.sorted(typeOrdering))
+
+  @deprecated("Prefer DocumentRenderer.directivesRenderer.render instead", "2.3.1")
+  def renderSchemaDirectives(directives: List[Directive]): String =
+    DocumentRenderer.directivesRenderer.render(directives)
+
+  @deprecated("Prefer DocumentRenderer.directiveDefinitionsRenderer.render instead", "2.3.1")
+  def renderDirectives(directives: List[__Directive]): String =
+    DocumentRenderer.directiveDefinitionsRenderer.render(directives.map(_.toDirectiveDefinition))
+
+  @deprecated("Prefer DocumentRenderer.isBuiltinScalar instead", "2.3.1")
+  private[caliban] def isBuiltinScalar(name: String): Boolean =
+    DocumentRenderer.isBuiltinScalar(name)
+
+  @deprecated("Prefer DocumentRenderer.descriptionRenderer instead", "2.3.1")
+  private[caliban] def renderDescription(description: Option[String], newline: Boolean = true): String =
+    if (newline) DocumentRenderer.descriptionRenderer.render(description)
+    else DocumentRenderer.descriptionRenderer.renderCompact(description)
+
+  @deprecated("Prefer DocumentRenderer.renderTypeName instead", "2.3.1")
+  private[caliban] def renderTypeName(fieldType: __Type): String =
+    DocumentRenderer.renderTypeName(fieldType)
+}