Remove deprecated module: "request" from cli

[munozemilio]

Fixes #749
Since "request" is now deprecated this PR replaces it with node fetch.

[codecov-commenter]

Codecov Report

Merging #913 into master will decrease coverage by 4.49%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #913      +/-   ##
==========================================
- Coverage   60.34%   55.84%   -4.50%     
==========================================
  Files         220      219       -1     
  Lines       18582    16377    -2205     
  Branches     2452     2335     -117     
==========================================
- Hits        11213     9146    -2067     
+ Misses       6776     6642     -134     
+ Partials      593      589       -4     

Impacted Files	Coverage Δ
packages/command/src/readpipeddata.ts	65.21% <0.00%> (-18.12%)	⬇️
packages/config/src/commands/config/index.ts	60.00% <0.00%> (-15.00%)	⬇️
...kages/luis/src/commands/luis/application/create.ts	60.00% <0.00%> (-13.34%)	⬇️
packages/lg/src/commands/lg/index.ts	66.66% <0.00%> (-11.12%)	⬇️
...ages/lu/src/parser/qna/alterations/qnaConverter.js	40.00% <0.00%> (-10.00%)	⬇️
packages/luis/src/commands/luis/version/import.ts	75.00% <0.00%> (-9.79%)	⬇️
...maker/src/commands/qnamaker/alterations/replace.ts	73.68% <0.00%> (-9.65%)	⬇️
packages/luis/src/commands/luis/cross-train.ts	77.27% <0.00%> (-9.62%)	⬇️
...ages/qnamaker/src/commands/qnamaker/cross-train.ts	77.27% <0.00%> (-9.62%)	⬇️
...ckages/qnamaker/src/commands/qnamaker/kb/delete.ts	86.95% <0.00%> (-9.48%)	⬇️
... and 117 more

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