feat(rust-client): Add support for unsigned integer and more signed integer formats

[SimonIT]

see OAI/OpenAPI-Specification#4564

fixes #22031

@frol (2017/07) @farcaller (2017/08) @richardwhiuk (2019/07) @paladinzh (2020/05) @jacob-pro (2022/10) @dsteeley (2025/07)

PR checklist

• Read the contribution guidelines.
• Run the following to build the project and update samples:

  ./mvnw clean package || exit
  ./bin/generate-samples.sh ./bin/configs/*.yaml || exit
  ./bin/utils/export_docs_generators.sh || exit
  

  (For Windows users, please run the script in WSL)
  Commit all changed files.
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Summary by cubic

Adds support for additional integer formats in the Rust client generator, mapping int8, int16, uint8, uint16, uint32, and uint64 to the corresponding Rust types. Previously only int32 and int64 were handled, so other formats fell through to the default. This fixes #22031.

^{Written for commit 08933e0. Summary will update on new commits.}

[cubic-dev-ai]

All reported issues were addressed across 2 files

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