Convert OAS files in YAML format into JSON format

[jabrena]

Example:

• https://stackoverflow.com/questions/55978052/how-to-generate-json-examples-from-openapi-3-0-yaml-file
• https://www.baeldung.com/java-write-to-file
• https://github.com/TheCodeCache/yml2sql-utils/blob/master/src/main/java/com/local/datalake/parser/YamlV3Parser.java
• https://github.com/swagger-api/swagger-inflector/blob/master/src/test/java/io/swagger/oas/test/examples/ExampleBuilderTest.java
• https://stackoverflow.com/questions/34733253/converting-a-swagger-yaml-file-to-json-from-the-command-line
• https://github.com/OAI/OpenAPI-Specification/blob/main/.github/workflows/convert-examples-to-json.yaml
• https://stackoverflow.com/questions/23744216/how-do-i-convert-from-yaml-to-json-in-java

[jabrena]

Added support