Begin to support CTC models (#119)

Please see https://k2-fsa.github.io/sherpa/onnx/pretrained_models/offline-ctc/nemo/index.html for a list of pre-trained CTC models from NeMo.

.github/workflows/windows-x86.yaml

@@ -8,6 +8,7 @@ on:
       - '.github/workflows/windows-x86.yaml'
       - '.github/scripts/test-online-transducer.sh'
       - '.github/scripts/test-offline-transducer.sh'
+      - '.github/scripts/test-offline-ctc.sh'
       - 'CMakeLists.txt'
       - 'cmake/**'
       - 'sherpa-onnx/csrc/*'
@@ -18,6 +19,7 @@ on:
       - '.github/workflows/windows-x86.yaml'
       - '.github/scripts/test-online-transducer.sh'
       - '.github/scripts/test-offline-transducer.sh'
+      - '.github/scripts/test-offline-ctc.sh'
       - 'CMakeLists.txt'
       - 'cmake/**'
       - 'sherpa-onnx/csrc/*'
@@ -31,6 +33,7 @@ permissions:
 
 jobs:
   windows_x86:
+    if: false # disable windows x86 CI for now
     runs-on: ${{ matrix.os }}
     name: ${{ matrix.vs-version }}
     strategy:
@@ -73,6 +76,14 @@ jobs:
 
           ls -lh ./bin/Release/sherpa-onnx.exe
 
+      - name: Test offline CTC for windows x86
+        shell: bash
+        run: |
+          export PATH=$PWD/build/bin/Release:$PATH
+          export EXE=sherpa-onnx-offline.exe
+
+          .github/scripts/test-offline-ctc.sh
+
       - name: Test offline transducer for Windows x86
         shell: bash
         run: |