Revamp Path's equal function to case insensitive

[ljiazh3ng]

resolves #404
This pr:

• [x] Revamp equals function
• [x] Add test case for equals function

[netlify[bot]]

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[codecov[bot]]

Codecov Report

Merging #405 into master will increase coverage by 0.11%. The diff coverage is 84.61%.

@@             Coverage Diff              @@
##             master     #405      +/-   ##
============================================
+ Coverage     66.80%   66.91%   +0.11%     
  Complexity      509      509              
============================================
  Files            97       97              
  Lines          1982     1989       +7     
  Branches        195      195              
============================================
+ Hits           1324     1331       +7     
  Misses          579      579              
  Partials         79       79              

Impacted Files	Coverage Δ	Complexity Δ
...in/java/com/notably/commons/path/RelativePath.java	65.95% <50.00%> (ø)	14.00 <0.00> (ø)
...in/java/com/notably/commons/path/AbsolutePath.java	90.69% <100.00%> (+1.80%)	18.00 <0.00> (ø)

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