Search sticker packs by title in sticker search screen

[spazzylemons]

First time contributor checklist

• [x] I have read how to contribute to this project
• [x] I have signed the Contributor License Agreement

Contributor checklist

• [x] I am following the Code Style Guidelines
• [x] I have tested my contribution on these devices:
  • Pixel 8, Android 14
• [x] My contribution is fully baked and ready to be merged as is
• [x] I ensure that all the open issues my contribution fixes are mentioned in the commit message of my first commit using the Fixes #1234 syntax

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Description

The sticker search screen currently only allows users to search for sticker by their corresponding emoji. This is inconvenient when a sticker you are trying to find does not have an obvious emoji. On Telegram, sticker search shows sticker packs with a matching title first, followed by emoji matches. These changes to the search screen implement this functionality.

Installed sticker packs with a title that partially or fully matches the search query are displayed in full in the search results. After these results, emoji matches are displayed.

Screenshot of the feature:

[alex-signal]

Hi! I'm going to run this by product and see whether they have any concerns.