refactor(memmap): migrate to Poetry

This change refactors the memmap tool into a Poetry project, with its
own dependencies. You can continue to run it manually with:

    poetry run memory <args>

Change-Id: I346283df1b8bfad4babc1f5a3861dab94d4a006a
Signed-off-by: Chris Kay <chris.kay@arm.com>
16 files changed