Consider using just the yaml package for handling !include funtionality

[bayc]

Use yaml package for !include functionality

Currently, we depend on pyyaml-include package for enabling !include functionality in our input files. This feature would remove that dependency and adopt the same method that is used in the FLORIS repository for supporting the !include functionality.

Proposed solution

We would implement the same strategy as used in FLORIS, shown here: https://github.com/NREL/floris/blob/main/floris/utilities.py#L340

Alternatives considered

Keep it the way it is, but currently running into testing issues after pyyaml-include released a new major version.