Add support for TestContainers

[danielcweber]

This adds initial preview support for configuring TestContainers around a provider setup such that the according container is started whenever a first query is being executed. This makes easy in-memory test setups possible.

[codecov]

Codecov Report

Attention: Patch coverage is 55.38462% with 29 lines in your changes missing coverage. Please review.

Project coverage is 83.07%. Comparing base (61162cf) to head (b3d39e0).
Report is 6 commits behind head on 12.x.

Files with missing lines	Patch %	Lines
...tainers/TestContainersWithContainerConfigurator.cs	54.23%	14 Missing and 13 partials ⚠️
...t.TestContainers/ProviderConfiguratorExtensions.cs	0.00%	0 Missing and 1 partial ⚠️
...pport.TestContainers/TestContainersConfigurator.cs	80.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             12.x    #1798      +/-   ##
==========================================
- Coverage   83.34%   83.07%   -0.27%     
==========================================
  Files         252      255       +3     
  Lines        6826     6891      +65     
  Branches     1486     1507      +21     
==========================================
+ Hits         5689     5725      +36     
- Misses        500      514      +14     
- Partials      637      652      +15     

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