fix: description of parameters

[smyrick]

The graphql description was supposed to fall back to the description of the type of the argument if there was none. This was not working as we have to fall back to the KClass first.

Also I added more unit tests for getting the list type and array type and simplified the directives adding to state

[codecov-io]

Codecov Report

Merging #118 into master will increase coverage by 0.17%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #118      +/-   ##
============================================
+ Coverage     90.07%   90.25%   +0.17%     
  Complexity      155      155              
============================================
  Files            47       47              
  Lines           504      503       -1     
  Branches        116      114       -2     
============================================
  Hits            454      454              
  Misses           10       10              
+ Partials         40       39       -1

Impacted Files	Coverage Δ	Complexity Δ
...pedia/graphql/generator/types/ObjectTypeBuilder.kt	94.73% <ø> (-0.27%)	2 <0> (ø)
...dia/graphql/generator/types/PropertyTypeBuilder.kt	68.42% <ø> (-1.58%)	6 <0> (ø)
...a/graphql/generator/extensions/kClassExtensions.kt	100% <100%> (+7.14%)	0 <0> (ø)	⬇️
...aphql/generator/extensions/kParameterExtensions.kt	100% <100%> (ø)	0 <0> (ø)	⬇️
...dia/graphql/generator/types/FunctionTypeBuilder.kt	77.41% <100%> (-0.71%)	8 <3> (ø)
...n/com/expedia/graphql/generator/SchemaGenerator.kt	100% <100%> (ø)	27 <2> (ø)	⬇️
...in/kotlin/com/expedia/graphql/TopLevelObjectDef.kt
.../main/kotlin/com/expedia/graphql/TopLevelObject.kt	100% <0%> (ø)	1% <0%> (?)

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