Add automatic tests with Github Actions

[justin-h-loi]

Current setup:

• Runs on push/pull_request to master
• Images: Ubuntu-20.04:py38 and Ubuntu-22.04:py10
• Tests: tox unit and integration tests

[codecov-commenter]

Codecov Report

Merging #703 (840bd6a) into master (837eeaf) will increase coverage by 0.03%.
Report is 29 commits behind head on master.
The diff coverage is 84.94%.

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@@            Coverage Diff             @@
##           master     #703      +/-   ##
==========================================
+ Coverage   96.59%   96.62%   +0.03%     
==========================================
  Files          79       79              
  Lines       16893    17492     +599     
==========================================
+ Hits        16317    16902     +585     
- Misses        576      590      +14     

Files Changed	Coverage Δ
kmip/pie/client.py	98.78% <40.00%> (-0.60%)	⬇️
kmip/core/factories/attribute_values.py	78.80% <50.00%> (-0.73%)	⬇️
kmip/core/messages/messages.py	86.77% <50.00%> (-0.33%)	⬇️
kmip/pie/objects.py	99.48% <55.55%> (-0.52%)	⬇️
kmip/core/messages/contents.py	97.86% <66.66%> (-0.36%)	⬇️
kmip/core/enums.py	100.00% <100.00%> (ø)
kmip/core/messages/payloads/discover_versions.py	100.00% <100.00%> (ø)
kmip/core/messages/payloads/query.py	100.00% <100.00%> (ø)
kmip/services/server/auth/slugs.py	100.00% <100.00%> (ø)
kmip/services/server/crypto/engine.py	98.84% <100.00%> (-0.01%)	⬇️
... and 3 more

... and 35 files with indirect coverage changes

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