[NPM] get_purl returns None if the input is a URLs with 3 path segments: namespace, name, version

[jloehel]

packageurl-python/src/packageurl/contrib/url2purl.py

Lines 146 to 147 in 04a706a

	if len(segments) != 2:
	return

Something like this, with 3 path segments, is also possible: https://registry.npmjs.org/@esbuild/freebsd-arm64/0.21.5

Input: https://registry.npmjs.org/@esbuild/freebsd-arm64/0.21.5
Returns: None
Expected: pkg:npm/%40esbuild/freebsd-arm64@0.21.5

[tdruez]

@jloehel I've added support for 3 path segments URLs in #170

It's available in the latest release at https://github.com/package-url/packageurl-python/releases/tag/v0.16.0