Parsing and validation of URIs (RFC 3986) and IRIs (RFC 3987)

The `rfc3987` Python library provides regular expressions and utilities for parsing and validating Uniform Resource Identifiers (URIs) as per RFC 3986 and Internationalized Resource Identifiers (IRIs) according to RFC 3987. The current version is 1.3.8. Development on the original GitHub repository has ceased, and the project is now archived, with development reportedly moved to Codeberg, implying a largely unmaintained or very slow release cadence on PyPI.