termux/termux-app ? reverse-engineered prompt

I want to build an Android app that works as a full-featured terminal emulator and Linux environment. When you open the app, it should give you a command line, just like you'd get on a Linux computer, where you can run shell commands.

The most important feature is that it needs its own package manager, so users can install other tools and programming languages directly from the terminal, using something like pkg install. It should be a powerful environment, not just a simple shell.

The app should also be extendable through plugins. For example, there could be plugins to customize the terminal's appearance with new fonts and colors, another one to run scripts when the phone boots up, and one to let scripts access Android device features through an API. Build this as a native Android app using Java. Make sure it's compatible with recent versions of Android, but it should also try to support older devices where possible.