Update AGP to 7.3.0, java to 11, kotlin to 1.6.10

[romtsn]

📜 Description

• Bumps current AGP version to 7.3.0
• Bumps preview AGP versions to 7.4.0-beta01 and 8.0.0-alpha01
• Bumps kotlin to 1.6.10, languageVersion to 1.4 (1.4 is supported from Gradle 7.0+, which is what our plugin supports anyway)
• Bumps Java to 11 (our plugin supports only AGP 7.0+, which, in turn, supports java 11+)
• Bumps compileSdkVersion to 33 on samples (tested manually, no problems)
• Switch from AndroidManifest package name to namespace attribute in gradle dsl

💡 Motivation and Context

Closes #373 #364 #274

💚 How did you test it?

📝 Checklist

• I reviewed the submitted code
• I added tests to verify the changes
• I updated the docs if needed
• No breaking changes

🔮 Next steps

[marandaneto]

@romtsn you can likely close #274 as well

[romtsn]

@marandaneto oh yeah, thanks for pointing out

[adinauer]

LGTM; one question regarding gradle version