feat: add controller endpoint functionality.

[baserrato]

This pull request introduces several new features and enhancements to the devopsknowledgeshareapi project, including new endpoints, a new entity, and corresponding tests. The most important changes include the addition of the Author entity and its controller, enhancements to the Post entity and its controller, and new test cases for the controllers and entities.

New Features:

• src/main/java/com/liatrio/dojo/devopsknowledgeshareapi/Author.java: Added the Author entity with id and name fields, along with their getters and setters.
• src/main/java/com/liatrio/dojo/devopsknowledgeshareapi/AuthorController.java: Created AuthorController with a /authors endpoint to return a list of authors.
• src/main/java/com/liatrio/dojo/devopsknowledgeshareapi/InfoController.java: Added InfoController with a /info endpoint that returns a welcome message.

Enhancements to Existing Features:

• src/main/java/com/liatrio/dojo/devopsknowledgeshareapi/Post.java: Added dateUpdated field with corresponding getter and setter methods.
• src/main/java/com/liatrio/dojo/devopsknowledgeshareapi/PostController.java: Introduced new endpoints in PostController to filter posts by title, first name, and link. Also added a PUT endpoint to update posts.

Tests:

• src/test/java/com/liatrio/dojo/devopsknowledgeshareapi/AuthorControllerTest.java: Added tests for AuthorController to verify the /authors endpoint.
• src/test/java/com/liatrio/dojo/devopsknowledgeshareapi/PostTest.java: Added tests for the new dateUpdated field in the Post entity.

Miscellaneous:

• src/functionalTest/java/com/liatrio/dojo/devopsknowledgeshareapi/InfoControllerTest.java: Commented out the InfoControllerTest class.
• src/main/java/com/liatrio/dojo/devopsknowledgeshareapi/PostRepository.java: Added methods to PostRepository to find posts by title, first name, and link.