Add JCEFHtmlPanelProvider to MD extensions
Add JCEFHtmlPanelProvider to MD extensions

GitOrigin-RevId: 399167720b00071be93eecdef0c5aaf5a1b99b02
allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community