Enforce LeakActivity to fit system windows

[0legg]

To ship new updates on Google Play Store, developers should target Android 15 (SDK 35). Most important behavior change at this version is the egde-to-edge enforcement.

For LeakCanary it surfaces as content being cut from top and bottom of the screen, making the topmost leak non-accessible, so you have to add more leaks to debug your leaks.

This change adds an MVP support for manual edge-to-edge configuration. The proper support will require adding a bunch of libraries, and updating a lot of dependencies which is contrary to LeakCanary lean dependency approach.

Tested using sample app (recompiled locally with compileSdk/targetSdk set to 35).

Before	After

[CLAassistant]

All committers have signed the CLA.

[0legg]

COME ON CLA BOT I WORKED AT SQUARE FOR 4 YEARS

[0legg]

@pyricau can i haz stamp?