fix: wrongly shared schema by fields

[sdghchj]

Describe the PR
If there are more than two fields with the same redefined type which especially based on a primitive type, they will share a schema in fault. If one of them modified the schema, another will be affected.

fix : every field gets a copy of the schema unless the schema is a ref schema, and then complete it with field properties.

Relation issue
#1342

[codecov]

Codecov Report

Base: 95.60% // Head: 95.55% // Decreases project coverage by -0.04% ⚠️

Coverage data is based on head (3d7eb8a) compared to base (e6723fe).
Patch coverage: 85.71% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1389      +/-   ##
==========================================
- Coverage   95.60%   95.55%   -0.05%     
==========================================
  Files          16       16              
  Lines        3023     3035      +12     
==========================================
+ Hits         2890     2900      +10     
- Misses         74       75       +1     
- Partials       59       60       +1     

Impacted Files	Coverage Δ
schema.go	97.64% <77.77%> (-2.36%)	⬇️
parser.go	94.01% <100.00%> (+0.02%)	⬆️

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