Add support for log points

[DonJayamanne]

Fixes #1306
WIP - Need to add tests

This pull request:

• Has a title summarizes what is changing
• Includes a news entry file (remember to thank yourself!)
• [deferred] Add unit tests for log points #1426 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 #1406 into master will increase coverage by 0.08%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1406      +/-   ##
==========================================
+ Coverage   70.82%   70.91%   +0.08%     
==========================================
  Files         271      271              
  Lines       12488    12470      -18     
  Branches     2213     2207       -6     
==========================================
- Hits         8845     8843       -2     
+ Misses       3501     3486      -15     
+ Partials      142      141       -1

Impacted Files	Coverage Δ
src/client/debugger/mainV2.ts	76.92% <100%> (-0.81%)	⬇️
src/client/common/configSettings.ts	88.16% <0%> (ø)	⬆️
src/client/common/types.ts	100% <0%> (ø)	⬆️
src/client/providers/jediProxy.ts	71.36% <0%> (+0.09%)	⬆️
...rc/client/debugger/PythonProcessCallbackHandler.ts	53.61% <0%> (+0.65%)	⬆️
src/client/providers/signatureProvider.ts	88.67% <0%> (+2.96%)	⬆️
src/client/activation/downloader.ts	24% <0%> (+3.54%)	⬆️

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