decoder for open vocabulary keyword spotting (#505)

* various fixes to ContextGraph to support open vocabulary keywords decoder

* Add keyword spotter runtime

* Add binary

* First version works

* Minor fixes

* update text2token

* default values

* Add jni for kws

* add kws android project

* Minor fixes

* Remove unused interface

* Minor fixes

* Add workflow

* handle extra info in texts

* Minor fixes

* Add more comments

* Fix ci

* fix cpp style

* Add input box in android demo so that users can specify their keywords

* Fix cpp style

* Fix comments

* Minor fixes

* Minor fixes

* minor fixes

* Minor fixes

* Minor fixes

* Add CI

* Fix code style

* cpplint

* Fix comments

* Fix error

.github/workflows/test-python-online-websocket-server.yaml

@@ -45,7 +45,7 @@ jobs:
       - name: Install Python dependencies
         shell: bash
         run: |
-          python3 -m pip install --upgrade pip numpy sentencepiece
+          python3 -m pip install --upgrade pip numpy pypinyin sentencepiece
 
       - name: Install sherpa-onnx
         shell: bash