Generation of Scenarios from OpenAPI specifications (POC)

Fixes Issue

This is a proof of concept of a generator of Zerocode scenarios from OpenAPI specifications.

Currently implemented in a separate module: zerocode-openapi
Provides a single entry point generateAll that takes two arguments:
- File name or url where the OpenAPI specification is located.
- A folder where the generated scenarios will be placed (name of scenarios match the name of the path in the specification).
Integration tests generate scenarios from the POC demonstrator: Swagger Petstore specification.
End to End tests (manual execution) run the generated scenarios agains the real petstore backend.
Additional performance test (manual) generates scenarios from the OpenAPI specification of the GitHub REST API.
Provisional documentation with more details in the module README.md file

[x] New Unit tests were added
- [ ] Covered in existing Unit tests
[x] Integration tests were added
- [ ] Covered in existing Integration tests
[x] Test names are meaningful
[x] Feature manually tested and outcome is successful
[x] PR doesn't break any of the earlier features for end users
- [ ] WARNING! This might break one or more earlier earlier features, hence left a comment tagging all reviewrs
[x] Branch build passed in CI
[x] No 'package.*' in the imports
[x] Relevant DOcumentation page added or updated with clear instructions and examples for the end user
- [ ] Not applicable. This was only a code refactor change, no functional or behaviourial changes were introduced
[ ] Http test added to http-testing module(if applicable) ?
- [x] Not applicable. The changes did not affect HTTP automation flow
[ ] Kafka test added to kafka-testing module(if applicable) ?
- [x] Not applicable. The changes did not affect Kafka automation flow