Convert animation package to Kotlin

[t895]

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:

• Virtual device - Pixel 3a, Android 14.0

• [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

This converts the files in the org.thoughtcrime.securesms.animation package within the Signal-Android module to Kotlin