feat: Implement openapi client code generator | NPG-6475 (#580)

# Description

Implement openapi client generator to automatically generate
cat-data-service client code

## Type of change

- [X] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [X] This change requires a documentation update

## How Has This Been Tested?

- [X] Navigate to the test folder and run
`earthly +generate-client`

## Checklist

- [X] My code follows the style guidelines of this project
- [X] I have performed a self-review of my code
- [X] I have commented my code, particularly in hard-to-understand areas
- [X] I have made corresponding changes to the documentation
- [X] My changes generate no new warnings
- [X] I have added tests that prove my fix is effective or that my
feature works
- [X] New and existing unit tests pass locally with my changes
- [X] Any dependent changes have been merged and published in downstream
modules

.gitignore

@@ -107,6 +107,7 @@ result*
 .vscode
 **/.idea/
 .temp/
+tests/tmp/
 
 # std
 .std

tests/Earthfile

@@ -0,0 +1,27 @@
+VERSION 0.7
+
+FROM debian:stable-slim
+
+# BASH, CURL, GPG, NODEJS, NPM, JRE
+dependencies:
+    RUN apt-get update
+    RUN apt-get install bash
+    RUN apt-get install curl -y
+    RUN apt-get install gpg -y
+    RUN curl -fsSL https://deb.nodesource.com/gpgkey/nodesource-repo.gpg.key | gpg --dearmor -o /etc/apt/keyrings/nodesource.gpg
+    RUN apt-get install nodejs -y
+    RUN apt-get install npm -y
+    RUN apt-get install default-jre -y
+
+generate-client:
+    FROM +dependencies
+
+    # TODO(@nicopado): Get the correct file from openapi doc generation target - https://github.com/input-output-hk/catalyst-core/issues/589
+    ARG openapispec_file="./petstore.yaml"
+    COPY $openapispec_file .
+
+    RUN npm install @openapitools/openapi-generator-cli -g
+
+    RUN openapi-generator-cli validate -i $openapispec_file
+
+    RUN openapi-generator-cli generate -i $openapispec_file -g rust -o ./tmp/client/ --package-name cat-data-service-client