chore: configure Github Actions.

[tomplus]

Use GitHub Actions to run unit and e2e tests.
Tox and Travis has been removed.

[codecov]

Codecov Report

Merging #105 into master will decrease coverage by 62.90%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master     #105       +/-   ##
===========================================
- Coverage   93.74%   30.84%   -62.91%     
===========================================
  Files          23      768      +745     
  Lines        1582    88062    +86480     
===========================================
+ Hits         1483    27159    +25676     
- Misses         99    60903    +60804     

Impacted Files	Coverage Δ
kubernetes_asyncio/watch/watch.py	95.00% <0.00%> (-0.05%)	⬇️
kubernetes_asyncio/config/openid.py	100.00% <0.00%> (ø)
kubernetes_asyncio/config/openid_test.py	100.00% <0.00%> (ø)
...o/client/models/extensions_v1beta1_ingress_list.py	40.54% <0.00%> (ø)
...ncio/client/models/v1_rolling_update_deployment.py	40.00% <0.00%> (ø)
...etes_asyncio/client/api/autoscaling_v2beta2_api.py	7.24% <0.00%> (ø)
...tes_asyncio/client/models/v1_node_selector_term.py	40.00% <0.00%> (ø)
...asyncio/client/models/apps_v1beta1_scale_status.py	40.00% <0.00%> (ø)
...s/policy_v1beta1_runtime_class_strategy_options.py	39.28% <0.00%> (ø)
kubernetes_asyncio/client/models/v1_pod.py	41.46% <0.00%> (ø)
... and 741 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 27ac054...41f3565. Read the comment docs.