Implement searching functions for the Request Overview buttons

[woxihyc]

User story

1. As a user
2. I want to search for specific things with the buttons
3. So that I can find the information conveniently

Acceptance criteria

• user can search through the drop-down
• user could type in keywords for matching results
• the selected attributes will be applied correctly and show the results

Definition of done

• Can be demoed
• Fully tested with the unit test
• Code well structured and formatted (hold to code conventions)
• Clear explaination of code
• No syntax/runtime errors
• Codes are peerly reviewed
• Communicate issues by leaving comments on github