[gen] newtype aliases

[hochgi]

basic implementation.
Aliased types is only supported for primitives in this PR.

fixes #2962
/claim #2962

TODO:

• make it configurable
• when opt-out, replace alias with original primitive name
• add more tests to cover most common scenarios:
  • collections of aliased newtypes
  • collections of un-aliased primitives
  • path aliased newtype params
  • path un-aliased primitive params
  • query aliased newtype params
  • query un-aliased primitive params
• documentation

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[jdegoes]

Looks good to me, may want to get @987Nabil to take a quick look too.

[987Nabil]

Will do tomorrow. Already too sleepy 😴