IndieAuth support (#1811)

* Able to authenticate user against IndieAuth. For #1273

* WIP server indieauth endpoint. For https://github.com/owncast/owncast/issues/1272

* Add migration to remove access tokens from user

* Add authenticated bool to user for display purposes

* Add indieauth modal and auth flair to display names. For #1273

* Validate URLs and display errors

* Renames, cleanups

* Handle relative auth endpoint paths. Add error handling for missing redirects.

* Disallow using display names in use by registered users. Closes #1810

* Verify code verifier via code challenge on callback

* Use relative path to authorization_endpoint

* Post-rebase fixes

* Use a timestamp instead of a bool for authenticated

* Propertly handle and display error in modal

* Use auth'ed timestamp to derive authenticated flag to display in chat

* don't redirect unless a URL is present

avoids redirecting to `undefined` if there was an error

* improve error message if owncast server URL isn't set

* fix IndieAuth PKCE implementation

use SHA256 instead of SHA1, generates a longer code verifier (must be 43-128 chars long), fixes URL-safe SHA256 encoding

* return real profile data for IndieAuth response

* check the code verifier in the IndieAuth server

* Linting

* Add new chat settings modal anad split up indieauth ui

* Remove logging error

* Update the IndieAuth modal UI. For #1273

* Add IndieAuth repsonse error checking

* Disable IndieAuth client if server URL is not set.

* Add explicit error messages for specific error types

* Fix bad logic

* Return OAuth-keyed error responses for indieauth server

* Display IndieAuth error in plain text with link to return to main page

* Remove redundant check

* Add additional detail to error

* Hide IndieAuth details behind disclosure details

* Break out migration into two steps because some people have been runing dev in production

* Add auth option to user dropdown

Co-authored-by: Aaron Parecki <aaron@parecki.com>

webroot/js/components/chat/chat-menu.js

@@ -20,6 +20,7 @@ export const ChatMenu = (props) => {
     noVideoContent,
     handleChatPanelToggle,
     onUsernameChange,
+    showAuthModal,
     onFocus,
     onBlur,
   } = props;
@@ -34,6 +35,15 @@ export const ChatMenu = (props) => {
     if (chatMenuOpen) setView('main');
   }, [chatMenuOpen]);
 
+  const authMenuItem =
+    showAuthModal &&
+    html`<li>
+      <button type="button" id="chat-auth" onClick=${showAuthModal}>
+        Authenticate
+        <span><${ChatIcon} /></span>
+      </button>
+    </li>`;
+
   return html`
   <${Context.Provider} value=${props}>
     <div class="chat-menu p-2 relative shadow-lg" ref=${chatMenuRef}>
@@ -55,7 +65,7 @@ export const ChatMenu = (props) => {
       >
         ${username}
       </span>
-       <${CaretDownIcon} className="w-8 h-8"/> 
+       <${CaretDownIcon} className="w-8 h-8"/>
       </button>
       ${
         chatMenuOpen &&
@@ -74,6 +84,7 @@ export const ChatMenu = (props) => {
                 onBlur=${onBlur}
               />
             </li>
+            ${authMenuItem}
             <li>
               <button
                 type="button"