[REQ][rust] Map uint32 format to native u32

[ticosax]

Is your feature request related to a problem? Please describe.

I would like openapi-generator to support for native u32 (and probably other unsigned types) for the rust generator

Describe the solution you'd like

For given openapi spec

my_u32_number:
  type: integer
  format: uint32
  maximum: 4294967295
  minimum: 0

I would like the generated code in rust to map the type as u32 instead of i32

Describe alternatives you've considered

Tried with other openapi generators