Add cluster resize menu option

[justinmills]

The underlying sdk support was already there, it was only missing wiring up to the command layer. I
did not implement the autoscale option.

[codecov-io]

Codecov Report

Merging #190 into master will increase coverage by 0.04%.
The diff coverage is 90.9%.

@@            Coverage Diff             @@
##           master     #190      +/-   ##
==========================================
+ Coverage   83.02%   83.06%   +0.04%     
==========================================
  Files          30       30              
  Lines        1938     1949      +11     
==========================================
+ Hits         1609     1619      +10     
- Misses        329      330       +1

Impacted Files	Coverage Δ
databricks_cli/clusters/cli.py	93.96% <100%> (+0.5%)	⬆️
databricks_cli/clusters/api.py	53.84% <50%> (-0.33%)	⬇️

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[andrewmchen]

Thanks for the contribution!