Fix: Remove SchemaUriResolver and check in schema.json instead

[localheinz]

This PR

• removes the SchemaUriResolver and checks in schema.json instead

Fixes #254.
Replaces #255.

💁‍♂ This picks up the original idea of @drupol (see #170) to check in the schema - I believe this is the best approach for now. In the meanwhile I can sort something out using GitHub actions to keep schema.json updated.

[codecov]

Codecov Report

Merging #273 into master will increase coverage by 7.03%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #273      +/-   ##
============================================
+ Coverage        80%   87.03%   +7.03%     
+ Complexity       39       35       -4     
============================================
  Files             3        2       -1     
  Lines           175      162      -13     
============================================
+ Hits            140      141       +1     
+ Misses           35       21      -14

Impacted Files	Coverage Δ	Complexity Δ
src/NormalizePlugin.php	72.72% <100%> (+2.72%)	3 <0> (ø)	⬇️

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[drupol]

Great :-)