Add multi-keyword emoji search support

[louisa-uno]

Summary

The emoji search functionality currently requires exact name matches (e.g., "neocat_comfy_happy"). I propose to support multiple space-separated keywords (e.g., "neocat happy") in the search, matching emojis that contain all specified terms. This feature common on many other clients.

Purpose

This enhancement addresses the difficulty of finding emojis through the Aria app due to limited search functionality. Users often don't recall the exact emoji names but can remember parts of the name. It won't conflict with the existing search functionality since emoji names cannot contain spaces

Do you want to implement this feature yourself?

• Yes, I will implement this by myself and send a pull request