Introduce the MergeOption class

[oswaldobapvicjr]

This push introduces the following enhancements:

• New MergeOption marker interface
• New concrete JsonMergeOption to allow setting the pair of distinct key and path, for advanced merging of arrays
• Make JSON merge objects thread-safe by moving from holding instance object distinctKeys to accepting a var-args of MergeOption as a method parameter
• Add a new Configurion.merge(Configurtion, MergeOption[]) method for advanced options

[codecov]

Codecov Report

Merging #89 (62e03c8) into master (15d76e7) will increase coverage by 0.22%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master      #89      +/-   ##
============================================
+ Coverage     99.02%   99.24%   +0.22%     
- Complexity      489      492       +3     
============================================
  Files            68       69       +1     
  Lines           923      929       +6     
  Branches         70       70              
============================================
+ Hits            914      922       +8     
+ Misses            7        5       -2     
  Partials          2        2              

Impacted Files	Coverage Δ
...nfectory/merger/PropertiesConfigurationMerger.java	100.00% <ø> (ø)
...c/main/java/net/obvj/confectory/Configuration.java	100.00% <100.00%> (ø)
...confectory/merger/AbstractConfigurationMerger.java	100.00% <100.00%> (ø)
...fectory/merger/GenericJsonConfigurationMerger.java	98.61% <100.00%> (ø)
...nfectory/merger/JSONObjectConfigurationMerger.java	100.00% <100.00%> (ø)
...va/net/obvj/confectory/merger/JsonMergeOption.java	100.00% <100.00%> (ø)
...ain/java/net/obvj/confectory/util/StringUtils.java	100.00% <100.00%> (ø)
...tory/merger/GsonJsonObjectConfigurationMerger.java	100.00% <100.00%> (ø)
...ory/merger/JacksonJsonNodeConfigurationMerger.java	100.00% <100.00%> (ø)
...y/merger/JsonOrgJSONObjectConfigurationMerger.java	100.00% <100.00%> (ø)

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