RTEMS | libdebugger: Provide support for gdb agent expressions (#5556)

[Joel Sherrill (@joel)]

Joel Sherrill created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5556



## Summary

GDB can compile expressions into byte code and pass it to the target. libdebugger should support these.

For example, this is used in conditional breakpoints. The [documentation](https://sourceware.org/gdb/current/onlinedocs/gdb.html/Agent-Expressions.html) describes it along with the rationale for its existence.

There is an implementation in the GDB source (gdb/gdbserver/ax.c) which is unfortunately GPL and cannot be used with RTEMS. 

I came across an implementation in Rust while initially researching this but am not finding it again. If someone locates this or other implementations, please update.

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5556
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