Adding Support for the Scrutiny Debugger Instrumentation Library

This project will integrate the Scrutiny Embedded instrumentation library to RTEMS. The result of this project will be an instrumentation interface that provides in-field debugging and an alternative to JTAG-based stop mode debugging, which is particularly useful for hobbyists and beginners, or for those debugging systems which are live. Deliverables will include a working two-way UART transport, integration of Scrutiny functions to RTEMS, the ability to expose specific metrics from RTEMS to Scrutiny, a user facing API for developers, a package under the RTEMS Source Builder titled rtems-scrutiny, and the necessary test suites for all use cases. This effort will provide RTEMS users with an effective Scrutiny port which can then successfully be hooked up to their respective clients for streamlined debugging.