Allow disabling of merging restrictions with base in configuration

[mingyaulee]

v2.1.954 has been a breaking change due to the merging of restrictions in 4539c1e.

As a result, properties with numeric restrictions were previously generated as string and now generated as numeric types (byte/ushort/uint/int/long/etc.). This configuration allows projects to update to the latest version gradually with the ability to opt-out from the new behaviour temporarily.

With the configuration, projects using the package can update to the latest version in 2 parts, one with only changes to comments and attributes, and after that with only changes in the generated property types.

[codecov]

Codecov Report

Attention: Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 94.08%. Comparing base (4120626) to head (fc1028a).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
XmlSchemaClassGenerator/Generator.cs	0.00%	2 Missing ⚠️
XmlSchemaClassGenerator/ModelBuilder.cs	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #528      +/-   ##
==========================================
- Coverage   94.17%   94.08%   -0.09%     
==========================================
  Files          21       21              
  Lines        3159     3164       +5     
  Branches      495      496       +1     
==========================================
+ Hits         2975     2977       +2     
- Misses        120      122       +2     
- Partials       64       65       +1     

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