Filter / Search Method assignment 2

Create a search method that allows you to filter by State.

You can also add a search method to the county if not then it will later be added to assignments.

Start by locating the assignment and existing region-search entry points in the Java Spring Boot project. Read how regions and assignments are represented, then define completion as filtering assignments by state, with county search included only if the existing structure supports it; verify the behavior with the project's available tests.

Written by the indexing model from the issue text.