Add missing `similar` #17

Job	Run time
Tests (1, abstracttensor, windows-latest) / Tests - abstracttensor	6m 43s
Tests (1, linalg, ubuntu-latest) / Tests - linalg	5m 40s
Tests (1, abstracttensor, ubuntu-latest) / Tests - abstracttensor	6m 17s
Tests (1, linalg, macOS-latest) / Tests - linalg	4m 1s
Tests (1, abstracttensor, macOS-latest) / Tests - abstracttensor	4m 26s
Tests (1, linalg, windows-latest) / Tests - linalg	6m 8s
Tests (1, vectorspaces, macOS-latest) / Tests - vectorspaces	50s
Tests (1, vectorspaces, ubuntu-latest) / Tests - vectorspaces	1m 9s
Tests (lts, abstracttensor, macOS-latest) / Tests - abstracttensor	2m 32s
Tests (1, vectorspaces, windows-latest) / Tests - vectorspaces	1m 41s
Tests (lts, abstracttensor, ubuntu-latest) / Tests - abstracttensor	4m 10s
Tests (lts, abstracttensor, windows-latest) / Tests - abstracttensor	4m 16s
Tests (lts, linalg, macOS-latest) / Tests - linalg	3m 12s
Tests (lts, linalg, ubuntu-latest) / Tests - linalg	4m 19s
Tests (lts, linalg, windows-latest) / Tests - linalg	4m 22s
Tests (lts, vectorspaces, macOS-latest) / Tests - vectorspaces	48s
Tests (lts, vectorspaces, ubuntu-latest) / Tests - vectorspaces	53s
Tests (lts, vectorspaces, windows-latest) / Tests - vectorspaces	1m 21s
	1h 2m 48s

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