Add support for Composer in purl2url #202

Job	Run time
Lint & mypy	14s
Test & build (py3.12 on ubuntu-latest)	16s
Test & build (py3.11 on ubuntu-latest)	13s
Test & build (py3.10 on ubuntu-latest)	23s
Test & build (py3.9 on ubuntu-latest)	13s
Test & build (py3.8 on ubuntu-latest)	15s
Test & build (py3.7 on ubuntu-latest)	17s
Test & build (py3.12 on windows-latest)	40s
Test & build (py3.11 on windows-latest)	40s
Test & build (py3.10 on windows-latest)	49s
Test & build (py3.9 on windows-latest)	41s
Test & build (py3.8 on windows-latest)	39s
Test & build (py3.7 on windows-latest)	1m 2s
Test & build (py3.12 on macos-latest)	21s
Test & build (py3.11 on macos-latest)	18s
Test & build (py3.10 on macos-latest)	21s
Test & build (py3.9 on macos-latest)	18s
Test & build (py3.8 on macos-latest)	24s
Test & build (py3.7 on macos-latest)	20s
	8m 24s

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