fix #2091 new analytics

fix #2091 new analytics

# Done

WPAnalyticsStatLoginFailed - LOGIN_FAILED, it's not implemented in iOS, so I chose the String "Login - Failed Login" as event name. (Should we add a property to track why the user can't login? 2fa, invalid username/pwd, invalid url, other)
WPAnalyticsStatLoginFailedToGuessXMLRPC - LOGIN_FAILED_TO_GUESS_XMLRPC, it's not implemented in iOS, so I chose the String "Login - Failed To Guess XMLRPC" as event name.
WPAnalyticsStatEditorTappedBlockquote - EDITOR_TAPPED_BLOCKQUOTE,
WPAnalyticsStatEditorTappedBold - EDITOR_TAPPED_BOLD,
WPAnalyticsStatEditorTappedImage - EDITOR_TAPPED_IMAGE,
WPAnalyticsStatEditorTappedItalic - EDITOR_TAPPED_ITALIC, called "Editor - Tapped Italics Button" (Italics with an "s"), like here https://github.com/wordpress-mobile/WordPress-iOS/blob/4dee05377d103e1d33df4a47ccc5f8f7542876d0/WordPress/Classes/Utility/Analytics/WPAnalyticsTrackerMixpanel.m#L336
WPAnalyticsStatEditorTappedLink - EDITOR_TAPPED_LINK,
WPAnalyticsStatEditorTappedMore - EDITOR_TAPPED_MORE,
WPAnalyticsStatEditorTappedStrikethrough - EDITOR_TAPPED_STRIKETHROUGH,
WPAnalyticsStatEditorTappedUnderline - EDITOR_TAPPED_UNDERLINE,
WPAnalyticsStatSupportOpenedHelpshiftScreen - SUPPORT_OPENED_HELPSHIFT_SCREEN, open Helpshift Support or FAQ (we can create 2 different events) - also it's not implemented in iOS, so I chose the String "Support - Opened Helpshift Screen" as event name.
WPAnalyticsStatNotificationLiked - NOTIFICATION_LIKED
WPAnalyticsStatNotificationUnliked - NOTIFICATION_UNLIKED
WPAnalyticsStatNotificationApproved - NOTIFICATION_UNAPPROVED
WPAnalyticsStatNotificationUnapproved - NOTIFICATION_UNAPPROVED


# Doesn't exists (yet) in wpandroid or can't be implemented

WPAnalyticsStatEditorDiscardedChanges, users can't discard changes (posts are auto saved)
WPAnalyticsStatEditorTappedHTML, no way to switch to html in the editor
WPAnalyticsStatEditorTappedOrderedList, no list button
WPAnalyticsStatEditorTappedUnorderedList, no list button
WPAnalyticsStatEditorTappedUnlink, no unlink button
WPAnalyticsStatSupportSentMessage, can't be detected (Helpshift is a closed source black box, once we open their Activity we can't track anything)
WPAnalyticsStatSupportSentReplyToSupportMessage, can't be detected (Helpshift is a closed source black box, once we open their Activity we can't track anything)
WPAnalyticsStatSupportReceivedResponseFromSupport, can only be detected from push notifications (not if the user "chat" with a HE) - so we're going to miss most of the responses
WPAnalyticsStatSelectedLearnMoreInConnectToJetpackScreen,There is no "Learn More" button in the connect to Jetpack screen (only "Install Jetpack" or "Cancel").
WPAnalyticsStatAddedSelfHostedSiteButJetpackNotConnectedToWPCom, we don't request Jetpack connection when a user adds a self hosted blog
WPAnalyticsStatSkippedConnectingToJetpack, we don't request Jetpack connection when a user adds a self hosted blog (we only ask this when he tries to connect to the Stats, and it's the default WPcom login dialog, not differentiated from a wpcom login issue).
WPAnalyticsStatNotificationsMissingSyncWarning, I can't find corresponding code in wpandroid
WPAnalyticsStatNotificationFollowAction, we don't have follow links in notification anymore
WPAnalyticsStatNotificationUnfollowAction, we don't have follow links in notification anymore