feat: add bouncy reaction animations

[avashilling]

Also changes reaction wrap alignment to line up with own message better (right to left, this fixes jerky movement when a reaction is added or removed from ones own message), and adds a burst animation when reactions are removed.

Thank you so much for your contribution to FluffyChat ❤️❤️❤️

Please make sure that your Pull Request meet the following acceptance criteria:

• Code formatting and import sorting has been done with dart format lib/ test/ and dart run import_sorter:main --no-comments
• The commit message uses the format of Conventional Commits
• The commit message describes what has been changed, why it has been changed and how it has been changed
• Every new feature or change of the design/GUI is linked to an approved design proposal in an issue
• Every new feature in the app or the build system has a strategy how this will be tested and maintained from now on for every release, e.g. a volunteer who takes over maintainership

Pull Request has been tested on:

• Android
• iOS
• Browser (Chromium based)
• Browser (Firefox based)
• Browser (WebKit based)
• Desktop Linux
• Desktop Windows
• Desktop macOS

[krille-chan]

Thank you very much for the PR but this is a very huge change. Such huge changes should better be discussed in an issue before to avoid frustration if those get rejected :-/

[avashilling]

@krille-chan I see, my bad! Should I make an issue to discuss it now, or is it too large of a change to be accepted?