Add Vehicle attributes object representations

[Zaboday]

Description

Added

• Class Avtocod\Specifications\Structures\VehicleBodyType for object representation of vehicle body type specifications
• Class Avtocod\Specifications\Structures\VehicleEngineType for object representation of vehicle engine type specifications
• Class Avtocod\Specifications\Structures\VehicleSteeringWheelType for object representation of vehicle steering wheel specifications
• Class Avtocod\Specifications\Structures\VehicleTransmissionType for object representation of vehicle transmission type specifications
• Class Avtocod\Specifications\Structures\VehicleDrivingWheelsType for object representation of vehicle driving wheels type specifications

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I wrote unit tests for my code (if tests is required for my changes)
• I have made changes in CHANGELOG.md file

[codecov-io]

Codecov Report

Merging #6 (128e04b) into master (d52eb74) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##              master        #6    +/-   ##
============================================
  Coverage     100.00%   100.00%            
- Complexity       113       183    +70     
============================================
  Files              8        13     +5     
  Lines            282       427   +145     
============================================
+ Hits             282       427   +145     

Impacted Files	Coverage Δ	Complexity Δ
src/Specifications.php	100.00% <100.00%> (ø)	41.00 <10.00> (+10.00)
src/Structures/VehicleBodyType.php	100.00% <100.00%> (ø)	12.00 <12.00> (?)
src/Structures/VehicleDrivingWheelsType.php	100.00% <100.00%> (ø)	12.00 <12.00> (?)
src/Structures/VehicleEngineType.php	100.00% <100.00%> (ø)	12.00 <12.00> (?)
src/Structures/VehicleSteeringWheelType.php	100.00% <100.00%> (ø)	12.00 <12.00> (?)
src/Structures/VehicleTransmissionType.php	100.00% <100.00%> (ø)	12.00 <12.00> (?)
... and 1 more

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