feat(smartcar): get/set charge limit

[EvanPeterson1324]

Overview

Adds get charge limit and set charge limit for electric vehicles

Asana: https://app.asana.com/0/1204073873904879/1204302264096980/f

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.04 🎉

Comparison is base (f2a724d) 98.63% compared to head (57056d9) 98.67%.

❗ Current head 57056d9 differs from pull request most recent head 1dac9dc. Consider uploading reports for the commit 1dac9dc to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #59      +/-   ##
==========================================
+ Coverage   98.63%   98.67%   +0.04%     
==========================================
  Files           6        6              
  Lines         292      302      +10     
==========================================
+ Hits          288      298      +10     
  Misses          4        4              

Impacted Files	Coverage Δ
lib/smartcar/vehicle.rb	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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[s-ashwinkumar]

Missing version bump, i am going to add that in