LSP-308 extract all <registryKey>s from JavaPlugin.xml to new RegistryKeys.xml file

GitOrigin-RevId: 804da9255d298774c6e23e6bbe393936d8d495cb

Author: bartekpacia

features-impl/java-base/resources/META-INF/language-server/features/javaBase/lsApiJavaBaseImpl.xml

@@ -1,7 +1,9 @@
-<idea-plugin>
+<idea-plugin xmlns:xi="http://www.w3.org/2001/XInclude">
   <id>features/javaBase/apiImpl</id>
   <vendor>JetBrains</vendor>
 
+  <xi:include href="/META-INF/RegistryKeys.xml"/>
+
   <extensionPoints>
     <extensionPoint qualifiedName="com.intellij.modcompletion.completionItemProvider"
                     beanClass="com.intellij.lang.LanguageExtensionPoint" dynamic="true">
@@ -31,6 +33,8 @@
       implementation="com.intellij.codeInsight.daemon.impl.quickfix.VariableTypeQuickFixProvider"/>
     <codeInsight.changeVariableTypeQuickFixProvider
         implementation="com.intellij.refactoring.typeMigration.TypeMigrationVariableTypeFixProvider"/>
+    <lang.documentationProvider language="JAVA" implementationClass="com.intellij.lang.java.JavaDocumentationProvider"/>
+    <lang.commenter language="JAVA" implementationClass="com.intellij.lang.java.JavaCommenter"/>
   </extensions>
   <extensions defaultExtensionNs="ls">
     <markdownDocProvider language="JAVA"