Parse queries to a map of `String` to `String` using `'&'` and `'='`

This would be a really useful utility function to have, though since I don't think `&` and `=` are actually part of the official URI specification I understand if you want to leave it out.

The issue mentions no files, tests, or entry points. Start by locating the repository's URI query parsing code and reviewing how query separators are handled; done should mean an agreed utility parses queries into a String-to-String map with defined behavior for '&' and '='.

Written by the indexing model from the issue text.