[Rust] Support for withAWSV4Signature option (!11690) · Merge requests · OpenAPI Tools / openapi-generator

Created by: jerome-jutteau

Hi @farcaller

This PR is about supporting AWSV4Signature in rust generator (see issue #11193 (closed)).

Few notes:

Option is by default set to false
Only reqwest is supported for now (non-async)
Created a new petstore sample folder with it's pom.xml and seems to be OK.
Put in a separate commit other samples/client/petstore/rust/* which seems to have changed
PR is based on master

Read the contribution guidelines.
Pull Request title clearly describes the work in the pull request and Pull Request description provides details about how to validate the work. Missing information here may result in delayed response from the community.
Run the following to build the project and update samples:
```
./mvnw clean package 
./bin/generate-samples.sh
./bin/utils/export_docs_generators.sh
```
Commit all changed files. This is important, as CI jobs will verify all generator outputs of your HEAD commit as it would merge with master. These must match the expectations made by your contribution. You may regenerate an individual generator by passing the relevant config(s) as an argument to the script, for example ./bin/generate-samples.sh bin/configs/java*. For Windows users, please run the script in Git BASH.
File the PR against the correct branch: master (5.3.0), 6.0.x
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