Add a Watson debug configuration for the experimental debugger.

[DonJayamanne]

Fixes #1031

This pull request:

• Has a title summarizes what is changing
• Includes a news entry file
• Has unit tests & code coverage is not adversely affected (within reason)
• Works on all actively maintained versions of Python (e.g. Python 2.7 & the latest Python 3 release)
• Works on Windows 10, macOS, and Linux (e.g. considered file system case-sensitivity)

[codecov]

Codecov Report

Merging #1105 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1105      +/-   ##
==========================================
- Coverage   71.67%   71.65%   -0.02%     
==========================================
  Files         260      260              
  Lines       11877    11877              
  Branches     2104     2104              
==========================================
- Hits         8513     8511       -2     
- Misses       3239     3240       +1     
- Partials      125      126       +1

Impacted Files	Coverage Δ
src/client/debugger/Main.ts	49.51% <0%> (-0.49%)	⬇️

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