Enhanced Discord Support (#7005)

* Add Discord Provider Prototype

* Add Discord Logo

* Add Plugin to Plugin Manager

* fixed discord auth support and added icon

* add csv role verification

* grab discord server icon and test server id and roles

* subdomain derived from server name

* use discord server specific nickname if available

* Cleanup and comment

* move discord api types to dev deps

* cleanup of server vs default params

* remove commented out lines

* revert envv.development

* revert in vscode

* update yarn lock

* add gif support for discord server icon

* add comment with docs link

* add env section for discord

* fix errors and clarify env

* add new cannot use without

* fix suggestions

plugins/discord/plugin.json

@@ -0,0 +1,6 @@
+{
+    "id": "discord",
+    "name": "Discord",
+    "priority": 10,
+    "description": "Adds a Discord authentication provider."
+}