Add map property in url params (!10154) · Merge requests · OpenAPI Tools / openapi-generator

Created by: agilob

Adding map property in url params to test generation of this specific case in generators as requested in https://github.com/OpenAPITools/openapi-generator/pull/10116#issuecomment-898190912

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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
```
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