qnamaker build CLI

[feich-ms]

QnA build CLI implementation for https://github.com/microsoft/botframework-cli/blob/master/specs/qnamaker-build.md.

To test, go to packages/qnamaker/bin folder and run below command:
run qnamaker:build --in ../test/fixtures/testcases/qnabuild/sandwich/qnafiles/sandwich.en-us.qna --subscriptionKey xxx --botName xxx --dialog --log

Update 4.7:
Multiturn is supported now. Multiturn with references is also supported. Corresponding tests are also added.

@vishwacsena @boydc2014, you can have a try to see if there are any issues.

[munozemilio]

CIL

[feich-ms]

@vishwacsena, I have reverted the file and url reference related logic in lu build core functionality. Meanwhile, I exposed two new functions naming importFileReference and importUrlReference. They import url or file reference into kb and return the extracted kb pairs with qna format. You can refer the qnabuild.test.js to see how to call them. Of course, they can be adjusted based on composer requirements in the future.

[vishwacsena]

@feich-ms this is looking good. I pushed up minor changes via this commit

[vishwacsena]

@munozemilio can you take a look and review the updates based on your PR feedback? Thanks!

[feich-ms]

@vishwacsena, I have updated the code/tests/docs per our discussion. All the qna files with same locale(default to en-us) will be merged into one and then published. The kb name will be botName(suffix).locale.qna. The dialog assets will also be named with botName.locale.qna.dialog(Recognizer) or botName.qna.dialog(MultiRecognizer). Please verify. If no other issues, we can merge this one.