Add support for basic authentication

[mrooding]

No description provided.

[codecov-io]

Codecov Report

Merging #27 into master will decrease coverage by 0.32%.
The diff coverage is 58.97%.

@@            Coverage Diff             @@
##           master      #27      +/-   ##
==========================================
- Coverage   55.85%   55.53%   -0.33%     
==========================================
  Files          12       12              
  Lines         478      506      +28     
==========================================
+ Hits          267      281      +14     
- Misses        172      181       +9     
- Partials       39       44       +5

Impacted Files	Coverage Δ
cmd/cli/main.go	27.44% <0%> (-0.53%)	⬇️
cmd/cli/flink/cancel.go	60% <100%> (ø)	⬆️
cmd/cli/flink/retrieve_jobs.go	66.66% <50%> (-6.67%)	⬇️
cmd/cli/flink/upload_jar.go	65.71% <60%> (-2.03%)	⬇️
cmd/cli/flink/savepoint.go	74.35% <71.42%> (-2.79%)	⬇️
cmd/cli/flink/run_jar.go	73.91% <71.42%> (-5.04%)	⬇️
cmd/cli/flink/client.go	81.81% <77.77%> (-18.19%)	⬇️

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