Token search commands that only match the last token in each line

This add two commands history-last-token-search-backward and
history-last-token-search-forward which behaves like bash's yank-last-arg. So
similar to history-token-search-* but only considers the last argument for
each command.

Closes #10756
Closes #11258

src/input_common.rs

@@ -90,6 +90,8 @@ pub enum ReadlineCmd {
     BackwardKillToken,
     HistoryTokenSearchBackward,
     HistoryTokenSearchForward,
+    HistoryLastTokenSearchBackward,
+    HistoryLastTokenSearchForward,
     SelfInsert,
     SelfInsertNotFirst,
     TransposeChars,