fix lu parser to accept quotes and interchanageable label in pharselist definition

[feich-ms]

fix #900.
Before the fix, phraselist with quotes and interchangeable label like below will not be parsed correctly

@ intent Application usesFeature "Application Synonyms"
@ phraselist "Application Synonyms"(interchangeable) disabledForAllModels = 
	- Application,Web pages,Sites

After the fix, it can be parsed and converted to luis json correctly. It can also parse other labels besides interchangeable if we need.

[codecov-commenter]

Codecov Report

Merging #915 into master will increase coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #915      +/-   ##
==========================================
+ Coverage   56.58%   56.67%   +0.08%     
==========================================
  Files         219      219              
  Lines       16760    16686      -74     
  Branches     2335     2328       -7     
==========================================
- Hits         9484     9457      -27     
+ Misses       6692     6651      -41     
+ Partials      584      578       -6     

Impacted Files	Coverage Δ
packages/lu/src/parser/lufile/parseFileContents.js	81.67% <100.00%> (-0.06%)	⬇️
...mathematics/confusion_matrix/AppConfusionMatrix.ts	6.66% <0.00%> (-22.32%)	⬇️
packages/cli/src/hooks/init/inithook.ts	62.26% <0.00%> (-0.78%)	⬇️
packages/config/src/commands/config/set.ts	100.00% <0.00%> (ø)
packages/config/src/utils/configfilehandler.ts	100.00% <0.00%> (ø)
packages/config/src/commands/config/set/luis.ts	100.00% <0.00%> (ø)
packages/config/src/commands/config/show/luis.ts	100.00% <0.00%> (ø)
...ackages/config/src/commands/config/set/qnamaker.ts	100.00% <0.00%> (ø)
...ckages/config/src/commands/config/set/telemetry.ts	100.00% <0.00%> (ø)
... and 12 more

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