Add back `Get-Counter` cmdlet for Windows#10933

Merged

TravisEz13 merged 8 commits intoPowerShell:masterfrom

SteveL-MSFT:perfcounters

Nov 6, 2019

Commits on Oct 30, 2019

add Get-Counter help to online help tests
SteveL-MSFT
committed

Commits on Nov 5, 2019

Address Travis' feedback, general clean up of code
SteveL-MSFT
committed
Merge branch 'master' of github.com:PowerShell/PowerShell into perfcounters
SteveL-MSFT
committed