Enhancement: Implement JsonPointer

[localheinz]

This pull request

• implements JsonPointer as a value object

[codecov]

Codecov Report

Merging #2 (a049694) into main (46547c2) will not change coverage.
The diff coverage is 100.00%.

❗ Current head a049694 differs from pull request most recent head c607de8. Consider uploading reports for the commit c607de8 to get more accurate results

@@             Coverage Diff             @@
##                main        #2   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity        11        19    +8     
===========================================
  Files              2         4    +2     
  Lines             32        53   +21     
===========================================
+ Hits              32        53   +21     

Impacted Files	Coverage Δ
src/Exception/InvalidJsonPointer.php	100.00% <100.00%> (ø)
src/JsonPointer.php	100.00% <100.00%> (ø)

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