[Rust] Adds UUID support from 'uuid' crate for better compile-time checks

[taufik-rama]

Hello 👋

I've some changes regarding Rust codegen.
Currently I uses UUID for one of the value, and I think it would be nice if we can get this functionality merged, since uuid crate support should already be pretty stable (it's already 1.0), and it provides better compile-time check than plain String value

I base this changes from my previous PR on #12409 since it fixes the bug on UUID handling, which is needed here

I don't have much experience on current Java/Mustache codebase 😅, so any review/feedback is appreciated

Before

// Single parameter
#[derive(Clone, Debug, Default)]
pub struct UsersDeleteParams {
    pub id: Option<String>,
    // ...
}

// Multi parameter
pub async fn users_delete(configuration: &configuration::Configuration, id: Option<&str> /* ... */ ) { /* ... */ }

After

// Single parameter
#[derive(Clone, Debug, Default)]
pub struct UsersDeleteParams {
    pub id: Option<Uuid>,
    // ...
}

// Multi parameter
pub async fn users_delete(configuration: &configuration::Configuration, id: Option<Uuid> /* ... */ ) { /* ... */ }

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[wing328]

@taufik-rama thanks for the PR. Can you please resolve the merge conflicts when you've time?

[taufik-rama]

@wing328 how would I update the generated samples version?

It seems that I got 6.0.0-SNAPSHOT version when I tried to update the samples, which trips up the CI check which currently generates 6.1.0-SNAPSHOT version

diff --git a/samples/server/petstore/rust-server/output/no-example-v3/.openapi-generator/VERSION b/samples/server/petstore/rust-server/output/no-example-v3/.openapi-generator/VERSION
index 5f68295f..66672d4e 100644
--- a/samples/server/petstore/rust-server/output/no-example-v3/.openapi-generator/VERSION
+++ b/samples/server/petstore/rust-server/output/no-example-v3/.openapi-generator/VERSION
@@ -1 +1 @@
-6.0.0-SNAPSHOT
\ No newline at end of file
+6.1.0-SNAPSHOT
\ No newline at end of file

I generated the samples using

$ ./bin/generate-samples.sh bin/configs/rust-*

[wing328]

@taufik-rama thanks for the PR. I don't think we need another option.

If the string type has the format "uuid", then we can do it in typeMappings: https://github.com/OpenAPITools/openapi-generator/blob/master/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RustClientCodegen.java#L169

If you change that line to map UUID to uuid::Uuid, would that meet your requirement?

[taufik-rama]

I've moved the PR to #12895 with that changes, seems to still be working fine for my usecase