Feat: additional initialisms

[micaelmalta]

The goal of this PR is to be able to provide additional Initialisms to the generator. Initialism like SSN or PTO should not be in camel case for example

How to use:

output-options:
  skip-prune: true
  name-normalizer: ToCamelCaseWithInitialisms
  additional-initialisms: 
    - NAME

[cnnrrss]

Great suggestion @micaelmalta. I've also been looking for this feature.

[micaelmalta]

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