Separate tests into different components for easier debugging.

[tillahoffmann]

This PR sets up different test runs for different components to simplify inspection of test failures. Only the core tests will be required to pass for pull requests. Ideally, all tests will pass, but, in light of a variety of containers being added to the project, maintaining all of them has become a substantial commitment. The change should also speed up the pipeline because tests are run in parallel. It also adds more recent python versions to the test matrix.

[codecov-commenter]

Codecov Report

Merging #212 (a9be3f2) into master (4fba477) will decrease coverage by 22.38%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master     #212       +/-   ##
===========================================
- Coverage   85.67%   63.28%   -22.39%     
===========================================
  Files          25       25               
  Lines         670      670               
  Branches       60       64        +4     
===========================================
- Hits          574      424      -150     
- Misses         76      230      +154     
+ Partials       20       16        -4     

Impacted Files	Coverage Δ
testcontainers/core/generic.py	77.14% <100.00%> (-8.58%)	⬇️
testcontainers/mssql.py	0.00% <0.00%> (-100.00%)	⬇️
testcontainers/postgres.py	0.00% <0.00%> (-100.00%)	⬇️
testcontainers/google/__init__.py	0.00% <0.00%> (-100.00%)	⬇️
testcontainers/compose.py	0.00% <0.00%> (-98.37%)	⬇️
testcontainers/google/pubsub.py	0.00% <0.00%> (-95.46%)	⬇️
testcontainers/mysql.py	0.00% <0.00%> (-84.00%)	⬇️
testcontainers/oracle.py	0.00% <0.00%> (-55.56%)	⬇️
testcontainers/core/container.py	70.21% <0.00%> (-7.45%)	⬇️

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[yakimka]

Nice work!