Make backends for Android separate *.so files so they can be opt-out when using ExecuTorch.

[msluszniak]

🚀 The feature, motivation and pitch

My problem is pretty much described here in Discord ExecuTorch channel: https://discord.com/channels/1334270993966825602/1337888330162897048/1494643087639576607 and https://discord.com/channels/1334270993966825602/1337888330162897048/1494757259253645424.

Alternatives

Don't have any alternatives.

Additional context

No response

RFC (Optional)

No response

cc @kirklandsign @cbilgin

[kirklandsign]

Something we can do: #10457

[msluszniak]

Yeap, that's exactly what we need. The ability to hot plug backends would be perfect for user of React Native ExecuTorch since they might opt-out some of unused backends, libs, etc. and make a bundle size of an app as minimal as possible.