Add MaskLayout.chip_copies dictionary #187

Job	Run time
Check copyright headers	37s
Check license	30s
Shellcheck	4s
Static code analysis	1m 50s
Tests (0.26.12)	1m 5s
Tests (non-🐧) (windows-latest, 0.26.12)	2m 54s
Verify documentation	1m 58s
Tests (1.latest)	1m 52s
Tests (non-🐧) (windows-latest, 1.latest)	3m 1s
Tests (non-🐧) (macos-latest, 1.latest)	1m 34s
Verify layer properties	35s
Deploy documentation	1m 13s
Publish test results	1m 9s
Build & Publish kqcircuits 🐍 📦	1m 2s
	19m 24s

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