Add Small Window feature

[Korb]

Is your feature request related to a problem? Please describe

I need a widget that displays a miniature view of the WiFiAnalyzer application running in the background on top of the current application.

Describe the solution you'd like

The Small Window (aka picture-in-picture mode) feature allows you to display a window overlaying other apps and pin it to the edge of the screen as an always-on small label. The label can be freely moved along the side edges of the screen.

Describe alternatives you've considered

Split-screen

Additional context

More details: Android Developers / Develop / Core areas / UI / Guides / Support multi-window mode

Provide Device/Android OS information

OS version: Funtouch OS 14
Model: Vivo T1 (4G, V2153)
Hardware version: MP_0.1
Build number: PD22010F_EX_A_14.2.9.0.W20
Baseband version: .HA.1.1.c2-00054-DIVAR_GENSP_PACK-1.29062.107
Kernel version: 4.19.157-perf+, 1 Sat Oct 12 11:14:50 CST 2024
Compile time: 12 Oct 2024 06:06:30
Android security update: 1 October 2024
Google Play system update: 1 October 2024
Software parameter update: 29 October 2024

[VREMSoftwareDevelopment]

Very interesting idea, sorry to say all current contributors are busy with other work.
When we don't have an opportunity or time to implement a feature, we encourage developers to fork the project and become a contributor.
It would be great to add new contributor to this project.
Looking forward to your PR.