feat: add literal buffer search and match navigation

src/ruby_host.rb

@@ -26,6 +26,7 @@ module Vamp
       insert insert_first_nonblank append append_line_end open_below open_above
       left right down up join_lines line_start line_end delete undo redo command
       normal newline backspace submit
+      search search_next search_previous
     ].each do |name|
       action = Action.new("core.#{name}".freeze).freeze
       define_singleton_method(name) { action }
@@ -33,7 +34,7 @@ module Vamp
   end
 
   module Modes
-    %w[normal insert command].each do |name|
+    %w[normal insert command search].each do |name|
       mode = Mode.new(name.freeze).freeze
       define_singleton_method(name) { mode }
     end