Create a separate module to support YAML (without Kaml, just SnakeKMP)

[OptimumCode]

Currently, it is hard to add support for YAML nodes from Kaml (#190) because the nodes does not have enough information for the validation.

As an alternative solution, a new module can be introduced with separate node hierarchy that can parse YAML (using SnakeKMP) and be used to validate YAML format against JSON schema

[OptimumCode]

As mentioned in the comment, the SnakeKMP provides an API that is similar to YamlNode and probably might be used instead for validation