* Convert `SoftwareInterrupt` to a unit struct
* Remove the `SystemExt` trait and rename `SystemParts` to `SystemControl`
* Update all examples an HIL tests to reflect previous API changes
* Clean up imports in `hil-test` package, address `clippy` lint warnings
* Update `CHANGELOG.md`
* Refactor testing, add defmt, add async gpio test
* Add test to ensure the some edge case pins can be used in async mode
* Add test for pin0
* clippy
* update test to use constants extracted from esp-idf's soc module
* address review comments
* simplify test to just initialize one pin as async
* changelog
* uart: allow driver to init as blocking or async
* adds a mode type param to Uart types
* remove #[interrupt] usage
* add constructor for blocking and async modes
* blocking constructor takes optional interrupt
* async chooses the correct handler to bind at runtime
* moves interrupt enable for uart into the driver
* changelog
