Upgrade to AGP 9

[MV-GH]

I took a quick attempt at it but AGP 9 is a complex upgrade.

Lots DSL changes in the build.

Some of the plugins don't support AGP 9 yet either which is blocking me atm from going further.

There is also this block that is gone

         postprocessing {
                isRemoveUnusedCode = true
                isObfuscate = false
                isOptimizeCode = true
                isRemoveUnusedResources = true
                proguardFiles("proguard-rules.pro")
            }

There is also this

This version of the Baseline Profile Gradle Plugin was tested with versions below Android
Gradle Plugin version Android Gradle Plugin version 9.0.0-alpha01 and it may not work as intended.
Current version is Android Gradle Plugin version 9.0.0.

This warning can be disabled setting the following property:
baselineProfile {
    warnings {
        maxAgpVersion = false
    }
}

Disabling this warning does not work at all.

I recommend waiting with this upgrade for now.

[dessalines]

I'm fine with waiting, a lot of my other android projects also have some issues with it (mainly the gradle plugins), but most of the config changes are pretty straightforward.

We can wait for the plugins to catch up, and just leave as open PRs.