Fix the py.typed marker file usage

As defined in PEP 561, the py.typed marker files for namespace packages
should be placed "in the submodules of the namespace". In commit
732ea8a, the markers were added to the subpackage roots, which serves no
purpose. This changeset addresses all marker-related issues in this
repository.

A summary of the changes:

- Removed the unnecessary py.typed markers from the subpackage roots.
- Added the missing marker to the prometheus exporter. Fixes #4113.
- Added the missing marker to opentelemetry._events.
- Removed the accidentally reintroduced jaeger exporters, which were
  originally removed in commit 1625b35.

Author: kjagiello

CHANGELOG.md

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+- Removed superfluous py.typed markers and added them where they were missing
+  ([#4172](https://github.com/open-telemetry/opentelemetry-python/pull/4172))
+
 ## Version 1.27.0/0.48b0 (2024-08-28)
 
 - Implementation of Events API