feat(class-transformer-decorators): add plugin

[butchmarshall]

Description

The class-transformer package implements the plainToClass method, which as its name suggests is used to map a plain object to a class.

This plugin decorates the generated classes with the required decorators to make this method work.

Related #855

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as
  expected)
• This change requires a documentation update

Screenshots/Sandbox (if appropriate/relevant):

Adding links to sandbox or providing screenshots can help us understand more about this PR and take
action on it as appropriate

How Has This Been Tested?

• should decorate @expose() on matching class properties and @type on all nested classes

This will test both the classWhitelist and classNamePattern config properties to ensure only the matched classes are decorated.

Test Environment:

• OS: Ubuntu 22.04.4 LTS
• @graphql-codegen/class-transformer-decorators:
• NodeJS: v20.17.0

Checklist:

• I have followed the
  CONTRIBUTING doc and the
  style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

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Latest commit: e29e536

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