Add ConversionService support.

[k163377]

BeanPropertyRowMapper同様、ConversionServiceを用いたデシリアライズ方法を追加した。
また、DefaultConversionServiceでサポートされているString -> Enumの変換は削除した。

[codecov-commenter]

Codecov Report

Merging #33 (44061df) into master (a15c934) will decrease coverage by 8.37%.
The diff coverage is 70.96%.

@@             Coverage Diff              @@
##             master      #33      +/-   ##
============================================
- Coverage     85.18%   76.81%   -8.38%     
- Complexity        3        7       +4     
============================================
  Files             4        4              
  Lines            54       69      +15     
  Branches          9       10       +1     
============================================
+ Hits             46       53       +7     
- Misses            4       13       +9     
+ Partials          4        3       -1     

Impacted Files	Coverage Δ	Complexity Δ
...ain/kotlin/com/mapk/krowmapper/DummyConstructor.kt	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
src/main/kotlin/com/mapk/krowmapper/KRowMapper.kt	72.22% <66.66%> (-27.78%)	7.00 <6.00> (+4.00)	⬇️
...main/kotlin/com/mapk/krowmapper/ParameterForMap.kt	84.78% <85.71%> (-0.94%)	0.00 <0.00> (ø)

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