feat(coderd/database): add task status and status view (#20235)

This change updates the `task_workspace_apps` table structure for
improved linking to workspace builds and adds queries to manage tasks
and a view to expose task status.

Updates coder/internal#948
Supersedes coder/coder#20212
Supersedes coder/coder#19773

coderd/database/queries/tasks.sql

@@ -0,0 +1,23 @@
+-- name: InsertTask :one
+INSERT INTO tasks
+	(id, organization_id, owner_id, name, workspace_id, template_version_id, template_parameters, prompt, created_at)
+VALUES
+	(gen_random_uuid(), $1, $2, $3, $4, $5, $6, $7, $8)
+RETURNING *;
+
+-- name: UpsertTaskWorkspaceApp :one
+INSERT INTO task_workspace_apps
+	(task_id, workspace_build_number, workspace_agent_id, workspace_app_id)
+VALUES
+	($1, $2, $3, $4)
+ON CONFLICT (task_id, workspace_build_number)
+DO UPDATE SET
+	workspace_agent_id = EXCLUDED.workspace_agent_id,
+	workspace_app_id = EXCLUDED.workspace_app_id
+RETURNING *;
+
+-- name: GetTaskByID :one
+SELECT * FROM tasks_with_status WHERE id = @id::uuid;
+
+-- name: GetTaskByWorkspaceID :one
+SELECT * FROM tasks_with_status WHERE workspace_id = @workspace_id::uuid;