hash_util: Rename _uri functions to _url.

It's 2022 and the WHATWG no longer recognizes the term URI. Everything
is now a URL or a type of URL. Which is great because it's way less
confusing. Details here:
https://url.spec.whatwg.org/

static/js/compose_actions.js

@@ -507,7 +507,7 @@ export function quote_and_reply(opts) {
             {defaultMessage: "{username} [said]({link_to_message}):"},
             {
                 username: `@_**${message.sender_full_name}|${message.sender_id}**`,
-                link_to_message: `${hash_util.by_conversation_and_time_uri(message)}`,
+                link_to_message: `${hash_util.by_conversation_and_time_url(message)}`,
             },
         );
         content += "\n";