py.typed not included in wheels

[hartungstenio]

Describe your environment

OS: ubuntu
Python version: Python 3.12
SDK version: 1.26.0
API version: 1.26.0

What happened?

#3385 added a py.typed marker to every subpackage.

This marker was added to the subpackage root, but it should stay with the package source code (inside /src)

ie: Instead of exporter/opentelemetry-exporter-prometheus, it should be exporter/opentelemetry-exporter-prometheus/src/opentelemetry/exporter/prometheus

Steps to Reproduce

Run mypy with --strict flag in a project importing from opentelemetry.exporter.prometheus.

Expected Result

Mypy succeeds

Actual Result

Mypy fails with

error: Skipping analyzing "opentelemetry.exporter.prometheus": module is installed, but missing library stubs or py.typed marker  [import-untyped]

Additional context

No response

Would you like to implement a fix?

Yes

[jenshnielsen]

I think this was resolved in #4084 included in 1.27

[xrmx]

@jenshnielsen there is a followup PR at #4172