FEATURE: Split up text segmentation for Chinese and Japanese.

* Chinese segmenetation will continue to rely on cppjieba
* Japanese segmentation will use our port of TinySegmenter
* Korean currently does not rely on segmentation which was dropped in c677877e4fe5381f613279901f36ae255c909573
* SiteSetting.search_tokenize_chinese_japanese_korean has been split
into SiteSetting.search_tokenize_chinese and
SiteSetting.search_tokenize_japanese respectively

lib/validators/search_tokenize_chinese_validator.rb

@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+class SearchTokenizeChineseValidator
+  def initialize(opts = {})
+  end
+
+  def valid_value?(value)
+    !SiteSetting.search_tokenize_japanese
+  end
+
+  def error_message
+    I18n.t("site_settings.errors.search_tokenize_japanese_enabled")
+  end
+end

lib/validators/search_tokenize_japanese_validator.rb

@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+class SearchTokenizeJapaneseValidator
+  def initialize(opts = {})
+  end
+
+  def valid_value?(value)
+    !SiteSetting.search_tokenize_chinese
+  end
+
+  def error_message
+    I18n.t("site_settings.errors.search_tokenize_chinese_enabled")
+  end
+end