feat: added Java code snippets for Aliases, CourseWork, and Topics

[mahima-desetty]

Description

This PR builds on the current Java code snippets to add missing code snippets to the external Classroom API documentation.

Fixes # (issue)

I added the following classes:

• CreateAlias
• AddAlias
• CreateCourseWork
• GetTopic
• CreateTopic
• UpdateTopic
• DeleteTopic
• ListTopics

Is it been tested?

• [x ] Development testing done

Checklist

• [x ] My code follows the style guidelines of this project
• [x ] I have performed a self-review of my own code
• [x ] I have performed a peer-reviewed with team member(s)
• [x ] I have commented my code, particularly in hard-to-understand areas
• [Doc changes can be made once the code is merged. ] I have made corresponding changes to the documentation
• [x ] My changes generate no new warnings
• [N/A ] Any dependent changes have been merged and published in downstream modules

[snippet-bot]

Here is the summary of changes.

You are about to add 16 region tags.

• classroom/snippets/src/main/java/AddAliasToCourse.java:16, tag classroom_add_alias_to_course_class
• classroom/snippets/src/main/java/AddAliasToCourse.java:56, tag classroom_add_alias_to_course_code_snippet
• classroom/snippets/src/main/java/CreateCourseWithAlias.java:16, tag classroom_create_course_with_alias_class
• classroom/snippets/src/main/java/CreateCourseWithAlias.java:54, tag classroom_create_course_with_alias_code_snippet
• classroom/snippets/src/main/java/CreateCourseWork.java:16, tag classroom_create_coursework_class
• classroom/snippets/src/main/java/CreateCourseWork.java:61, tag classroom_create_coursework_code_snippet
• classroom/snippets/src/main/java/CreateTopic.java:16, tag classroom_create_topic_class
• classroom/snippets/src/main/java/CreateTopic.java:56, tag classroom_create_topic_code_snippet
• classroom/snippets/src/main/java/DeleteTopic.java:16, tag classroom_delete_topic_class
• classroom/snippets/src/main/java/DeleteTopic.java:56, tag classroom_delete_topic_code_snippet
• classroom/snippets/src/main/java/GetTopic.java:16, tag classroom_get_topic_class
• classroom/snippets/src/main/java/GetTopic.java:57, tag classroom_get_topic_code_snippet
• classroom/snippets/src/main/java/ListTopics.java:16, tag classroom_list_topic_class
• classroom/snippets/src/main/java/ListTopics.java:59, tag classroom_list_topic_code_snippet
• classroom/snippets/src/main/java/UpdateTopic.java:16, tag classroom_update_topic_class
• classroom/snippets/src/main/java/UpdateTopic.java:57, tag classroom_update_topic_code_snippet

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