edje_cc: add option for verifying namespace usage

Summary:
when -N is passed, parts and program signals will be checked for
traditional namespacing based on the group name, causing compile failure
if inconsistency is detected

@feature

ref T6911

Reviewers: cedric, devilhorns

Reviewed By: cedric

Subscribers: committers

Tags: efl

Maniphest Tasks: T6911

Differential Revision: https://phab.enlightenment.org/D6036