fix: Use the emoji picker's search in getSuggestions

[TheSunCat]

Fixes #420
Tested on Linux and Android.

[TheOneWithTheBraid]

I really like the changes.

Two points to be considered :

• the renderer still uses package:emojis. In order to properly match all Emojis, it might be useful to sync the renderer using the other package too. E.g. 👩‍❤️‍👩 as a newer Emoji is simply recognized as regular text
• how far does that packages support skin tones ? In the drop down list I was only proposed yellow emojis

(Both should not block this PR but rather be discussed later.)

[TheOneWithTheBraid]

Dart analyzer fails, can you please apply dart format lib/ test/ and dart run import_sorter:main --no-comments ? Thanks !

[TheSunCat]

I really like the changes.

Thanks!

* the renderer still uses `package:emojis`. In order to properly match all Emojis, it might be useful to sync the renderer using the other package too. E.g. `👩‍❤️‍👩 ` as a newer Emoji is simply recognized as regular text

I don't know much about package:emojis (pretty new to Flutter) but it seems reasonable to use this package for everything emoji-related, so as to have consistent behavior througouht FluffyChat.

* how far does that packages support skin tones ? In the drop down list I was only proposed yellow emojis

This is the same package that was used for the emoji picker that comes up under the chat bar, which supports skin tones by long-tapping an emote. This is not really an option here as the suggestions list is awkward enough that long-tapping would be too much in my opinion.
An idea would be to support a global "default skin tone" option (maybe add a selector to the right of the emoji search bar from #454) to be used in this list. This would also allow faster access to sending an emote with the user's preferred skin tone from the emoji drawer, as they currently have to long-tap each emoji every time they need to send it.

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