rfc3986Query function
PHP http_build_query(..., PHP_QUERY_RFC3986) for flat parameters
(Laravel Arr::query): rawurlencode keys and values joined by &.
Implementation
String rfc3986Query(Map<String, String> parameters) => [
for (final entry in parameters.entries)
'${phpRawUrlEncode(entry.key)}=${phpRawUrlEncode(entry.value)}',
].join('&');