This commit refactors the project's module structure from the Rust 2015 `foo/mod.rs` style to the modern Rust 2018 `foo.rs` style.

This change was applied to all modules in the `src` directory, including nested modules. The primary motivation for this change is to align the project with current Rust idioms, which improves readability and maintainability.

No functional changes were made; this is purely a structural refactoring. The project compiles and passes all tests after this change.

This change introduces a `StreamInfo` struct to store metadata about a
stream, starting with the protocol name.

The `RunStream` trait has been updated with `get_info` and `set_info`
methods to allow for accessing and modifying this information. The
`set_info` method uses a closure to provide a flexible way to update
the `StreamInfo` struct.

All implementations of `RunStream` have been updated to include the
`StreamInfo` field and the new methods. The protocol name is now set
at the appropriate places in the listener and connector logic.

connect no pre create
This reverts commit 833e6e5

(cherry picked from commit 2b5c052)