Yaml Validator Iteration One into Main Branch

[abaskk-msft]

Feature

• This feature adds a Yaml Validator under the Persistence namespace. The inputs accepted are either a single yaml file or a directory of yaml files. Here is a rough UML of the structure of the project.
• Additionally users are able to see a stack trace of syntax errors. Specifically the file where an error was found and where the exact error with yaml pointer and schema pointer paths.

Validation

• Tested the VSCode extension still works despite the changes in schema format
• Unit tested the Validator class