Build C-APIs for published native DLL

[amirkutcher]

This change enables building the C-APIs within the published ortextension.dll, so tokenization functionalities could be used for modules that does not hold tokenizer nodes, and required external tokenization prior to inference.

[amirkutcher]

/azp run onnxruntime-extensions.CI

[azure-pipelines]

Commenter does not have sufficient privileges for PR 1017 in repo microsoft/onnxruntime-extensions

[amirkutcher]

/azp run onnxruntime-extensions.CI

[azure-pipelines]

Commenter does not have sufficient privileges for PR 1017 in repo microsoft/onnxruntime-extensions

[apsonawane]

Pipelines are failing because of this error:

"C:\Program Files\CMake\bin\cmake.exe" -G "Visual Studio 17 2022"  -DOCOS_ENABLE_CTEST=ON -DOCOS_ONNXRUNTIME_VERSION="1.18.1" -DONNXRUNTIME_PKG_DIR=.\onnxruntime-win-x64-1.18.1 -DOCOS_ENABLE_C_API -B out\Windows -S .
CMake Error: Parse error in command line argument: OCOS_ENABLE_C_API
 Should be: VAR:type=value