tests

Implement `Debug` for `Ramhorns` & `Template`. (#72) #82

Job	Run time
tests (stable, default, ubuntu-latest)	30s
tests (stable, indexes, ubuntu-latest)	33s
tests (beta, default, ubuntu-latest)	41s
tests (beta, indexes, ubuntu-latest)	41s
tests (nightly, default, ubuntu-latest)	39s
tests (nightly, indexes, ubuntu-latest)	40s
	3m 44s

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