feat: add dateUpdated field and search endpoints for posts

[baserrato]

This pull request introduces several new features and improvements to the devopsknowledgeshareapi project. The most important changes include adding new controllers for handling author and info requests, enhancing the Post and PostController classes with additional methods, and updating the test classes to cover the new functionalities.

New Controllers:

• src/main/java/com/liatrio/dojo/devopsknowledgeshareapi/AuthorController.java: Added a new AuthorController class with a getAuthors method to return a list of authors.
• src/main/java/com/liatrio/dojo/devopsknowledgeshareapi/InfoController.java: Added a new InfoController class with a getInfo method to return API information.

Enhancements to Post and PostController:

• src/main/java/com/liatrio/dojo/devopsknowledgeshareapi/Post.java: Added a dateUpdated field with corresponding getter and setter methods.
• src/main/java/com/liatrio/dojo/devopsknowledgeshareapi/PostController.java: Added new endpoints for searching posts by title, first name, and link, as well as an endpoint for updating posts. [1] [2]
• src/main/java/com/liatrio/dojo/devopsknowledgeshareapi/PostRepository.java: Added methods to find posts by title, first name, and link.

Test Class Updates:

• src/test/java/com/liatrio/dojo/devopsknowledgeshareapi/AuthorControllerTest.java: Added a new test class for AuthorController to verify the getAuthors endpoint.
• src/functionalTest/java/com/liatrio/dojo/devopsknowledgeshareapi/functional/InfoControllerTest.java: Added a new functional test class for InfoController to verify the getInfo endpoint.
• src/test/java/com/liatrio/dojo/devopsknowledgeshareapi/PostTest.java: Added tests for the new dateUpdated field in the Post class.