Add ResourceCleaner for stop containers after exit (#104)

[mrk-andreev]

I suggest to stop all containers after application stop. I used atexit like JVMHookResourceReaper in testcontainers-java.

[codecov-commenter]

Codecov Report

Merging #208 (3e0175b) into master (c5b7b1c) will decrease coverage by 0.40%.
The diff coverage is 61.53%.

❗ Current head 3e0175b differs from pull request most recent head d32e089. Consider uploading reports for the commit d32e089 to get more accurate results

@@            Coverage Diff             @@
##           master     #208      +/-   ##
==========================================
- Coverage   87.12%   86.72%   -0.41%     
==========================================
  Files          30       30              
  Lines         839      851      +12     
  Branches       58       58              
==========================================
+ Hits          731      738       +7     
- Misses         78       83       +5     
  Partials       30       30              

Impacted Files	Coverage Δ
testcontainers/core/docker_client.py	56.36% <61.53%> (+0.54%)	⬆️

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[gaby]

@mrk-andreev Any updates on this?