[Help wanted] Add OnlineNeMoCtcModelConfig to C API

[csukuangfj]

We have https://github.com/k2-fsa/sherpa-onnx/blob/d94506698daba388a251fc653c6f2c486006db91/sherpa-onnx/csrc/online-model-config.h#L22 in C++ API and we need to add it to c-api https://github.com/k2-fsa/sherpa-onnx/blob/d94506698daba388a251fc653c6f2c486006db91/sherpa-onnx/c-api/c-api.h#L79

(Please add it as the last struct member.)

Also, we need to update APIs of

• C#
• Go
• Swift
• Dart
• JavaScript
• WebAssembly

after C API is updated. We would appreciate any help from the community.

Note that you can create separate PRs to address each language.