[BUG][Rust] Bad module import generated with Option types

[mgalliou]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
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Description

Hi,

When generating rust client with default configuration, the generated code contains compilation errors related to models module importation inside Option types (models::models:: instead of models::):

error[E0433]: failed to resolve: could not find `models` in `models`
   --> src/apis/accounts_api.rs:101:157
    |
101 | ...configuration::Configuration, account: &str, r#type: Option<models::models::AchievementType>, completed: Option<bool>, page: Option<i32>, size: Option<i32>) -> Result<models::Data...
    |                                                                        ^^^^^^ could not find `models` in `models`
    |
help: consider importing this module
    |
12  + use crate::models;
    |
help: if you import `models`, refer to it directly
    |
101 - pub async fn get_account_achievements_accounts_account_achievements_get(configuration: &configuration::Configuration, account: &str, r#type: Option<models::models::AchievementType>, completed: Option<bool>, page: Option<i32>, size: Option<i32>) -> Result<models::DataPageAccountAchievementSchema, Error<GetAccountAchievementsAccountsAccountAchievementsGetError>> {
101 + pub async fn get_account_achievements_accounts_account_achievements_get(configuration: &configuration::Configuration, account: &str, r#type: Option<models::AchievementType>, completed: Option<bool>, page: Option<i32>, size: Option<i32>) -> Result<models::DataPageAccountAchievementSchema, Error<GetAccountAchievementsAccountsAccountAchievementsGetError>> {
    |

When generating using master (18b01ca), I also get following kind of error:

error[E0282]: type annotations needed
   --> src/apis/accounts_api.rs:110:87
    |
110 |         local_var_req_builder = local_var_req_builder.query(&[("type", &local_var_str.to_string())]);
    | 

openapi-generator version

7.10.0

OpenAPI declaration file content or url

https://api.artifactsmmo.com/openapi.json

Generation Details

 docker run --rm -v "$PWD:/local" openapitools/openapi-generator-cli generate \
             -i https://api.artifactsmmo.com/openapi.json \
             -g rust \
             -o /local/out/rust

Steps to reproduce

Build the generated crate using cargo build.