Extract memLogPeak() into function

[richardleggett]

Description

Extract logging of peak CHIP/RAM usage into callable function in memory.c/h for debugging purposes.

Checklist

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.

[richardleggett]

I'm not 100% sure about the codestyle or ordering so please let me know on those and I'll keep in mind for future.