feat: Add Git auth for GitHub, GitLab, Azure DevOps, and BitBucket (#4670)

* Add scaffolding

* Move migration

* Add endpoints for gitauth

* Add configuration files and tests!

* Update typesgen

* Convert configuration format for git auth

* Fix unclosed database conn

* Add overriding VS Code configuration

* Fix Git screen

* Write VS Code special configuration if providers exist

* Enable automatic cloning from VS Code

* Add tests for gitaskpass

* Fix feature visibiliy

* Add banner for too many configurations

* Fix update loop for oauth token

* Jon comments

* Add deployment config page

coderd/database/dump.sql

@@ -162,6 +162,16 @@ CREATE TABLE files (
     id uuid DEFAULT gen_random_uuid() NOT NULL
 );
 
+CREATE TABLE git_auth_links (
+    provider_id text NOT NULL,
+    user_id uuid NOT NULL,
+    created_at timestamp with time zone NOT NULL,
+    updated_at timestamp with time zone NOT NULL,
+    oauth_access_token text NOT NULL,
+    oauth_refresh_token text NOT NULL,
+    oauth_expiry timestamp with time zone NOT NULL
+);
+
 CREATE TABLE gitsshkeys (
     user_id uuid NOT NULL,
     created_at timestamp with time zone NOT NULL,
@@ -462,6 +472,9 @@ ALTER TABLE ONLY files
 ALTER TABLE ONLY files
     ADD CONSTRAINT files_pkey PRIMARY KEY (id);
 
+ALTER TABLE ONLY git_auth_links
+    ADD CONSTRAINT git_auth_links_provider_id_user_id_key UNIQUE (provider_id, user_id);
+
 ALTER TABLE ONLY gitsshkeys
     ADD CONSTRAINT gitsshkeys_pkey PRIMARY KEY (user_id);