SNOW-798828: Target .NET Standard 2.0

[sfc-gh-ext-simba-lf]

Description

Change the target framework to .NET Standard 2.0

Checklist

• [ ] Code compiles correctly
• [ ] Code is formatted according to Coding Conventions
• [ ] Created tests which fail without the change (if possible)
• [ ] All tests passing (dotnet test)
• [ ] Extended the README / documentation, if necessary
• [ ] Provide JIRA issue id (if possible) or GitHub issue id in PR name

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 85.52%. Comparing base (1465bda) to head (6ca7cec).

:exclamation: Current head 6ca7cec differs from pull request most recent head 7437435

Please upload reports for the commit 7437435 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #867      +/-   ##
==========================================
+ Coverage   85.43%   85.52%   +0.09%     
==========================================
  Files         106      106              
  Lines       10761    10760       -1     
  Branches     1029     1029              
==========================================
+ Hits         9194     9203       +9     
+ Misses       1318     1308      -10     
  Partials      249      249              

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[sfc-gh-mhofman]

Let's plan to make a note in the readme and with the docs team that although we target Standard 2.0 we do not confirm nor run the tests on Mono/Xamarin/UWP/Unity? @sfc-gh-knozderko @sfc-gh-ext-simba-lf @sfc-gh-ext-simba-hx @sfc-gh-dszmolka

[sfc-gh-ext-simba-lf]

Updated readme with the new supported versions