JsonPointer optimizations

[OptimumCode]

Rework JsonPointer to reduce time spent on creating a new one from the existing one.

Resolves #116

[codecov]

Codecov Report

Attention: Patch coverage is 95.89041% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 90.32%. Comparing base (05f589b) to head (680c475).

Files	Patch %	Lines
.../io/github/optimumcode/json/pointer/JsonPointer.kt	97.14%	1 Missing and 1 partial ⚠️
...n/io/github/optimumcode/json/pointer/extensions.kt	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #117      +/-   ##
==========================================
+ Coverage   90.15%   90.32%   +0.16%     
==========================================
  Files         120      120              
  Lines        3191     3205      +14     
  Branches      945      955      +10     
==========================================
+ Hits         2877     2895      +18     
+ Misses         53       50       -3     
+ Partials      261      260       -1     

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