Feat: Add single select to getAuthUrl

[adolfoportilla]

• Adds a new getAuthUrl function which takes in a POJO where a developer can set different params.
• Adds a single_select param which allows developers to generate a url with the flag to limit the number of vehicles a user can select to 1.

[codecov[bot]]

Codecov Report

Merging #58 into master will decrease coverage by 4.75%. The diff coverage is 0%.

@@             Coverage Diff              @@
##             master      #58      +/-   ##
============================================
- Coverage     53.47%   48.71%   -4.76%     
  Complexity       51       51              
============================================
  Files            17       17              
  Lines           389      427      +38     
  Branches         15       22       +7     
============================================
  Hits            208      208              
- Misses          172      210      +38     
  Partials          9        9

Flag	Coverage Δ	Complexity Δ
#integration	47.07% <0%> (-4.6%)	51 <0> (ø)
#test	6.08% <0%> (-0.6%)	5 <0> (ø)

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/com/smartcar/sdk/AuthClient.java	58.53% <0%> (-17.66%)	11 <0> (ø)

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[adolfoportilla]

Closing because this PR has the same but improved changes