Feat req: export specific register value

[flespark]

Type: Feature Request
Hi，Dear maintainers
In my embedded develop scene，I found that after changed some MCU config, one peripheral of MCU often can not work as previous any more, even though I repeatedly checked the modified code have not touch any relative register of the peripheral. So, to confirm if any relative register change, I have to debug old code, copy out all relative register one by one; then compile and debug new code, halt at same position, dump the registers again, copy two version registers to a diff tool for compare. Maybe a function export all or specific peripheral register will be a very facility for such scene debug

[cblack-f3]

Some sort of "Dump peripheral registers" would be great!