feat: configuration of k6 for performance tests

[ThisIsDemetrio]

Pull Request Type

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

Description

Using k6 to execute performance tests on a built CRUD Service instance in a docker container.

Includes:

• a list of scripts with the tests to be run with k6 with different cases, located in /bench/scripts;
• folders with definition of collections and views to be used with k6 tests, located in /bench/definitions;
• two docker-compose files (the first to build and run a MongoDB container and a CRUD Service container, the second to launch k6 runner file to execute tests), located in /bench;
• a script to generate mock data for one collections used for tests, located in /bench/utils;
• a new GitHub workflow file to execute performance test on a pipeline, to be triggered when released a new tag;

Also:

• updated the package.json with a some devDependencies used to run the script to generate mock data;
• updated the gitignore and the ignored files in package.json to avoid issues with the content of the /bench folder;
• documentation includes a paragraph explaining in detail how these tests work, how to run and how to improve them;

PR Checklist

• The commit message follows our guidelines included in the CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Does this PR introduce a breaking change?

• Yes
• No

Other information