feat: QnA import url

[zhixzhan]

Description

QnA import

QnA import from url/scratch will create <name>.source.qna:

> !# @source.url= <url>

...

For dialog.qna will import it by

[import](<name>.source.qna)
...

All up view can edit all imported qna file.

KB container based QnA structure.

Every created QnA container (from url/scratch) is a .source.qna file, and shared by all dialog.qna, import by file id or file path both work, locale can be ignored.

{
  ...
  qna: 'knowledge-base/en-us/${BOTNAME}.en-us.qna',
  sourceQnA: 'knowledge-base/source/${FILENAME}.source.qna',
  dialogs: {
      qna: 'dialogs/${DIALOGNAME}/knowledge-base/en-us/${DIALOGNAME}.en-us.qna',
  }
}

Lu Reference

refer by wildcard matcher */**

• [link name](<path>/*)
• [link name](<path>/**)

refer a file

• [link name](help.lu) refer by id
• [link name](help.en-us.lu) when not specify locale will auto fallback to current luFile's locale
• [link name](./help.lu) with path

refer a intent's utterances and patterns

• [link name](help.lu#HowToDrive)
• [link name](help.lu#HowToDrive*utterances*)
• [link name](help.lu#HowToDrive*patterns*)

refer file's utterances and patterns

• [link name](help.lu#*utterances*)
• [link name](help.lu#*patterns*)
• [link name](help.lu#*utterancesAndPatterns*)

QnA reference

• [link name](<path>/*)
• [link name](<path>/**)
• [link name](help.qna#$name?)
• [link name](help.qna#*alterations*?)
• [link name](help.qna#?question-to-find?)
• [link name](help.qna#*answers*?)

Known issue

1. Due to LU parser not support customized importResolver yet, client / LUEditor are not be able do intelligence auto-complete or find out imported file not existed. e.g.

[link name](helpNotExist.lu)

only when publishing time  check error. this is tracked via microsoft/botframework-cli#933

2. if a referenced intent not exist, the referenced' utterances will be empty, and do not block publishing. e.g.

[link name](help.lu#NotExistIntent)

Task Item

close #3668
close #3872
close #3988

Screenshots