Allow for extended ASCII chars in attribute values

[SRv6d]

Allow for extended ASCII chars in attribute values, making the parser no longer fully conformant with RFC 2622. Since commonly used WHOIS databases do not fully conform to the standard either, we need to follow suit to be a useful parser.

[codspeed-hq]

CodSpeed Performance Report

Merging #113 will not alter performance

_{Comparing umlaut (0ee4e6e) with main (bc15e4f)}

Summary

✅ 4 untouched benchmarks