Perl extension for Package URL (aka "purl")

Changes for 2.03 - 2023-11-09

• Improved validation during encode and decode "purl" string
• Fixed CPAN repository URL
• FIX Qualifiers are case sensitive (giterlizzi/perl-URI-PackageURL#4)
• FIX PURLs containing multiple namespaces segments parse incorrectly (giterlizzi/perl-URI-PackageURL#5)
• FIX Incorrect parsing of PURLs that begin with "pkg:/" (giterlizzi/perl-URI-PackageURL#6)
• Improved "t/99-official-purl-test-suite.t" test