Move transitions to enum

[ahopkins]

Putting all of the transition strings into an enum should make it easier to manage going forward.

[codecov]

Codecov Report

Merging #35 (779b95a) into actor (fe70a97) will increase coverage by 0.25%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            actor      #35      +/-   ##
==========================================
+ Coverage   94.54%   94.79%   +0.25%     
==========================================
  Files           5        5              
  Lines         458      480      +22     
  Branches       62       62              
==========================================
+ Hits          433      455      +22     
  Misses         18       18              
  Partials        7        7              

Flag	Coverage Δ
unittests	94.37% <100.00%> (+0.27%)	⬆️

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Impacted Files	Coverage Δ
jumpstarter/states.py	97.93% <100.00%> (+0.26%)	⬆️

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