Accept instance in FunctionBundleFactory

[findepi]

io.trino.plugin.ai.functions.AiFunctions is a great candidate to use FunctionBundleFactory to provide functions via standard annotation-based mechanism.

However, AiFunctions is stateful and FunctionBundleFactory currently can get functions only from static methods and stateless instances.

Enhance FunctionBundleFactory to support AiFunctions use case.

[findepi]

cc @electrum @dain

[electrum]

Sounds good to me.