Set focus to the terminal upon creation of a terminal using the Create Terminal command

[DonJayamanne]

Fixes #1315

This pull request:

• Has a title summarizes what is changing
• Includes a news entry file (remember to thank yourself!)
• 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 #1433 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1433      +/-   ##
==========================================
+ Coverage    70.8%   70.82%   +0.02%     
==========================================
  Files         271      271              
  Lines       12519    12519              
  Branches     2224     2224              
==========================================
+ Hits         8864     8867       +3     
+ Misses       3512     3511       -1     
+ Partials      143      141       -2

Impacted Files	Coverage Δ
src/client/common/terminal/types.ts	100% <ø> (ø)	⬆️
src/client/common/terminal/service.ts	100% <100%> (ø)	⬆️
src/client/providers/terminalProvider.ts	100% <100%> (ø)	⬆️
src/client/debugger/mainV2.ts	75% <0%> (-0.81%)	⬇️
src/client/debugger/PythonProcess.ts	47.91% <0%> (+2.08%)	⬆️

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