Publish Smithy-Python to Maven Central

[lucasmcdonald3]

Once Smithy-Python is GA, its codegen should be published to Maven Central.

This would allow developers to use Smithy-Python codegen in their projects without building from source.

smithy-rs has a similar thread with more context: smithy-lang/smithy-rs#421

[humanzz]

Hello team,

Any updates on publishing to Maven?