query method
Add query parameters
Implementation
MutUri query(String key, value) {
if (value is String || value is Iterable<String>) {
getQuery[key] = value;
} else if (value is Iterable) {
getQuery[key] = value.map((v) => v?.toString() ?? '');
} else if (value != null) {
getQuery[key] = value?.toString();
}
return this;
}