Blocking stdio

[ivmarkov]

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Submission Checklist 📝

• [v] I have updated existing examples or added new ones (if applicable).
• [v] I have used cargo fmt command to ensure that all changed code is formatted correctly.
• [v] I have used cargo clippy command to ensure that all changed code passes latest Clippy nightly lints.
• [v] My changes were added to the CHANGELOG.md in the proper section.

Pull Request Details 📖

Description

Ability to read from Rust std::io::stdin, by providing an easy way to
re-configure the ESP IDF console to use the full-blown buffered and interrupt-driven UART and USB-serial drivers.